TydalForce, I found this thread through searching for a way to improve my car radio reception and decided to try out the Firestick antenna. Believe it or not, I think it made my reception even worse so I don't think I have done something correctly installing it. I will tell my story below and hopefully someone can give me some advice. This will be a long post so please bear with me.
About 3 1/2 years ago I bought a 1996 Honda Civic to drive back and forth to work to save on fuel. My other vehicle is a 2003 Chevy 2500HD with a stock head unit and radio reception is perfect for any station I want to listen to. The car has never had great reception. It had a cheap aftermarket Jensen stereo and stock antenna when I bought it and would only pick up a fraction of the stations my truck would so I bought a new "stock" antenna. That seemed to help some but didn't last long. I lived with the poor reception for about 3 years and decided there had to be a solution. I came across this thread during a Google search and thought that the Firestick antenna would probably be just the ticket. I mounted it on the trunk just like you but for testing purposes I didn't hide the cable, just ran it through the back seats, between the two front seats, and then into the stereo. The reception was a little better but not much. Here is where it gets good...if I hold onto the cable and move it around the reception gets better or worse, like messing with television rabbit ears. Also, if I take the stereo out of the dash and sit it on the passenger seat (the wires are barely long enough), the reception gets somewhat better. I'm about to the point where I think it may be a problem with the stereo and might try replacing it next. I have found a Sony CD receiver at Crutchfield for $60 that has an FM sensitivity of 8 dBf. That is the best sensitivity rating I can find on there and I love that price!
Anyway, I put my story out there to see if anyone has any suggestions for me before I spend money and time on a new stereo. Could I have a grounding issue? Should the Firestick antenna be grounded somewhere? Anything else that jumps out at anybody?