Hidden radio antenna?
 

I've looked online at a few different types, but has anyone seen or used or had any luck with these? If you do a google search for "hidden vehicle radio antenna" and click on the amazon.com link, that one looks like it would work pretty well because it's amplified. But I can't tell if it would work inside a metal truck as it only refers to being behind fiberglass and plastic like on a boat. Others that I have looked at are like long strips but are not amplified and are a little more expensive also. Seems to me like the amplified one would be the best to go with, and seems like it should work better than the factory antenna.