how to improve FM signal on car/toolbox stereo

So I got this thing at lowes............ FM signal isnt the greatest. What would be the most simple way to improve signal?

I dont know if I can even take the toolbox apart to get to the back of the stereo (I assume I can make a key and pull the stereo out if I NEED TO). Its got a car antenna mounted to the back of the toolbox, and I dont know if it can be improved upon with adding wire or something.... I dont mess with car stereos often.

Odd question i know.......... I bought the box due to the price cut on a display model (perfect condition), and I really needed the depth of these drawers, and the 41" model wasnt big enough. The radio was just something that came with it.

http://www.lowes.com/pd_351108-5573...est&pl=1&currentURL=?Ntt=toolchest&facetInfo=

 

stereo is Pioneer DEH-2500UI

 

Hehehe

Do what we do in the shops.
Grab some bare wire and run it along the roof or wall.
One guy mounted a antenna on roof outside and ran the cable inside.
Put some tinfoil on it.

 

so, use 2 conductor........... wrap bare ends around the top of the existing antenna, then run vertical a few feet, and split and run horizontal right?

or completely bare wire exposed?

dumb question I know.

 

It all depends on the room, roof, building. I used wire In a "t" for my scanner.
A bare 6 foot for my radio.
One time we hooked two diferent radios together with a piece of tinfoil.
There was no set system to our madness hehehehehehe

 

perfect.............. Thank you Sir