I'm hoping this is somewhat of an original contribution to TW. I've seen a few threads about antennas being installed on the bed rails using nuts, bolts and rail-sized washers, but I had an idea after installing a Clutch SD bed rail bike mount a couple weeks back.
So, I decided to go with the Firestik K-24 antenna mount:
And ordered an extra hardware kit like the one that came with the bike mount:
Here it all is:
The hardware fit the mount perfectly:
Just slid it in the rail and tightened her down. I was debaiting facing the horizontal part of the mount forward or backward, I was somewhat concerned with the antenna bouncing into the back of the truck. After a few high speed runs over the speedbumps in a local parking lot though, I'm happy I put it forward. Looks much cleaner.
Sorry for the crappy photo:
Still need to get it all tuned, I'm going to lose the spring when my new antenna comes (this one is off of another vehicle). Overall, I am very pleased with the how it turned out. I tried to align the antenna with the black strip on the roof so it doesn't stick out as much when looking from behind. If anyone has any questions or comments send them my way!