$25.92
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K40 SF-400 Black 4' 1500W Superflex Tunable Fiberglass CB Whip Antenna

4.1 4.1 out of 5 stars 172 ratings
$25.92
Includes $2.08 Amazon discount. Details
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Purchase options and add-ons

Antenna Radio
Brand K40
Color Black
Maximum Range 10 Meters

About this item

  • Superflex 1/4" Fiberglass Rod
  • 1/4 Wave Length Design
  • Fits All 3/8" x 24 Threaded Mounts
  • Chrome Plated Whip Adapter
  • Mil-Spec Polyolefin Sheath
› See more product details

Additional Details

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Frequently bought together

K40 SF-400 Black 4' 1500W Superflex Tunable Fiberglass CB Whip Antenna
$25.92
Get it May 10 - 13
Only 7 left in stock - order soon.
Ships from and sold by PEPE DEALS INC..
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Marketty SS-3H CB Antenna Spring, Stainless Steel Heavy Duty CB Radio Antenna Mount Spring, Spring to Fit Mobile/in-Vehicle C
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Sold by MARKETTY and ships from Amazon Fulfillment.
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FIRESTIK K-4A CB RADIO ANTENNA HEAVY DUTY SO-239 STUD MOUNT (BULK)
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Get it as soon as Saturday, May 11
In Stock
Sold by Audiovideodirect and ships from Amazon Fulfillment.
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K40 SF-400 Black 4' 1500W Superflex Tunable Fiberglass CB Whip Antenna
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Price$25.92$35.99$22.49$20.25$45.99$21.99
Delivery
Get it May 10 - 13
Get it as soon as Saturday, May 11
Get it as soon as Saturday, May 11
Get it as soon as Saturday, May 11
Get it as soon as Wednesday, May 15
Get it as soon as Saturday, May 11
Customer Ratings
4.14.1 out of 5 stars172
4.34.3 out of 5 stars40
4.54.5 out of 5 stars301
4.44.4 out of 5 stars235
4.74.7 out of 5 stars533
4.54.5 out of 5 stars950
Value for money
—
4.6
4.2
3.7
4.5
4.2
Easy to install
—
3.6
4.8
4.4
4.7
4.7
Durability
—
—
3.5
—
4.4
4.4
Sold By
PEPE DEALS INC.
Audiovideodirect
Audiovideodirect
Amazon.com
GoodsWell
Audiovideodirect
maximum range
10 meters
1 miles
3 feet
4 feet
4 feet
2 feet
antenna description
Radio
Radio
Radio
—
Radio
Radio

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Product Warranty: For warranty information about this product, please click here

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K40 SF-400 Black 4' 1500W Superflex Tunable Fiberglass CB Whip Antenna

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Product Description

K40 Superflex gives you 180 degree whip action capability. The SF-400 features a tunable design with top loaded coil, and can be used as a single antenna or co-phased. This black fiberglass CB whip antenna is designed for CB and 10 meter radios, and has a frequency range of 26-30MHz.

Customer reviews

4.1 out of 5 stars
4.1 out of 5
172 global ratings

Customers say

Customers like the ease of tuning and flexibility of the antenna. For example, they mention it's easy to tune and has an adjustable tip. That said, opinions are mixed on quality.

AI-generated from the text of customer reviews

4 customers mention4 positive0 negative

Customers find the antenna easy to tune. They say the adjustable tip makes tuning very easy.

"Works great and easy to tune. Ill be ordering a couple more!" Read more

"Installed on rear door hinge mount. Tuned right up, SWR 1.5-1.7, not bad for off the roof installation. Performance is excellent...." Read more

"Excellent antenna, I even bought a second! This thing was tuned right out of the box, unheard of!" Read more

"...I should of orderd 2 and co-phased them. The adjustable tip makes tuning very easy. I'll recommend this product to friends." Read more

4 customers mention4 positive0 negative

Customers appreciate the antenna's extreme flexibility. They mention that it prevents damage and works flawlessly.

"...Great flexibility although I wouldn't try to double it over. Very durable, and stands up to the elements like a champ." Read more

"...works flawloessly. nice and flexible. ive bounced this antenna off of everything you can imagine...." Read more

"...the narrow profile that allows for less wind resistance and the extreme flexibility which prevented damage when I forgot to remove them before..." Read more

"Very good cb antenna! Good touch to my jeep! Very flexible can bend almost all the way! Would definitely recommend" Read more

33 customers mention20 positive13 negative

Customers have mixed opinions about the quality of the antenna. Some mention that it serves its purpose well, while others say that it broke within 5 months.

"Works great and easy to tune. Ill be ordering a couple more!" Read more

"...I bought this to go on a trail rig and farm truck and it serves its purpose well. K40 knows what they are doing and that's why I bought this...." Read more

"...I mounted it on a spring and it broke at the base. Upon inspection, the tube that the wire is would on is very thin...." Read more

"put it on my jeep with a uniden pro compact CB. works flawloessly. nice and flexible. ive bounced this antenna off of everything you can imagine...." Read more

Worked good before it broke
3 Stars
Worked good before it broke
Came in fast but only lasted a week before it broke
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Top reviews from the United States

rob
5.0 out of 5 stars Great antenna
Reviewed in the United States on February 10, 2024
Verified Purchase
Works great and easy to tune. Ill be ordering a couple more!
Helpful
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Gavin
5.0 out of 5 stars Quality K40 Antenna
Reviewed in the United States on September 2, 2015
Verified Purchase
This is a beast of an CB antenna! I bought this to go on a trail rig and farm truck and it serves its purpose well. K40 knows what they are doing and that's why I bought this. The adjustable stinger on the tip of the antenna makes SWR a breeze. No cutting here, just loosen the screw and reposition the stinger. The supplied K40 sticker doesn't stick to the antenna very long but that is petty and no big deal. Great flexibility although I wouldn't try to double it over. Very durable, and stands up to the elements like a champ.
2 people found this helpful
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keith
4.0 out of 5 stars I love it
Reviewed in the United States on March 13, 2024
Verified Purchase
Tuning
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Dan Celani
3.0 out of 5 stars K40 is a decent name but I wasn't satisfied with this product
Reviewed in the United States on May 25, 2016
Verified Purchase
K40 is a decent name but I wasn't satisfied with this product. To tune this antenna you need to loosen a set screw and raise or lower the tip. Well, the set screw is tightened so much that the enclosed allen wrench just spins around and doesn't do it's job. I'm going to have to drill out the allen set screw and replace it if I want to tune the antenna. I'm disappointed with K40.
One person found this helpful
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Patrick Fox
5.0 out of 5 stars works like a charm
Reviewed in the United States on June 11, 2013
Verified Purchase
put it on my jeep with a uniden pro compact CB. works flawloessly. nice and flexible. ive bounced this antenna off of everything you can imagine. its been closed in the garage door a few times, and driven on the highway for over 1000 miles now. still works like new. i havent even had to retune it.
i highly reccommend it.
8 people found this helpful
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Legal Eagle
5.0 out of 5 stars installed on FJ Cruiser
Reviewed in the United States on September 3, 2011
Verified Purchase
Installed on rear door hinge mount. Tuned right up, SWR 1.5-1.7, not bad for off the roof installation. Performance is excellent. I don't like the look of the stinger at the top of the antenna, but it is there for function, so it's worth it. A little wrench is included in the package, a nice touch. Great product, great service, great packaging, great price.
6 people found this helpful
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Dolf
2.0 out of 5 stars The antenna worked great with a low SWR
Reviewed in the United States on May 17, 2017
Verified Purchase
The antenna worked great with a low SWR, but it's very flimsey. I mounted it on a spring and it broke at the base. Upon inspection, the tube that the wire is would on is very thin. If K40 re-engineers the antenna with a stronger tube, then I believe that it would be an excellent antenna. I would not recommend it for a mobile application. The reason I gave it two stars is because if you use it in other than a mobile application it would work great, but as a mobile antenna it's one star if that.
One person found this helpful
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raymond malone
5.0 out of 5 stars wow it works :-)
Reviewed in the United States on July 4, 2016
Verified Purchase
finally a CB antenna that works on a jeep. I have tried then all 3', 4' 5' 6' antennas, no ground plane antenna, couldn't tune them
at all. I installed this K40 and boom tuned right in. anyone with a 4 wheeler I recommend this antenna highly. thanks K40 for a
great product that works
One person found this helpful
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Top reviews from other countries

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Francois
5.0 out of 5 stars Too expensive vs durability!
Reviewed in Canada on June 27, 2022
Verified Purchase
Already broken, went 1 time in the back country. It hit few branches at 5km/h and it broke at the base !
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James Jennings
5.0 out of 5 stars solid budget antenna
Reviewed in Canada on October 18, 2014
Verified Purchase
Great signal, very durable. I coupled it with a spring mount on my Jeep and it has held up to a lot of tree branches. It slaps around a bit on the highway but I'm used to it already. Good product.
2 people found this helpful
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cote christian
5.0 out of 5 stars Satisfaction
Reviewed in Canada on October 15, 2023
Verified Purchase
Pour mon pick-up
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dave
1.0 out of 5 stars Misrepresented
Reviewed in Canada on September 11, 2023
Verified Purchase
Wanted it for a handheld cb radio...doesnt fit because it was misrepresented.
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Matt
2.0 out of 5 stars One day and the tip is broken
Reviewed in Canada on February 22, 2024
Verified Purchase
Had this thing mounted on my truck for one day and the tip of the antenna already broke off. If this is any sign for how itll last i dont have high hopes for this antenna. At 60 bucks i expected a bit better.
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