Audio Systems: Fuzzy / Staic Car Radio after installing Sub Amp, antenna amplifier, plastic pillar

Question
Hi,

I have just installed a new amp (under the front passenger seat) and sub (in the boot) into my car which is the new Honda Civic.

However after doing so, I get alot of static and fuzzy reception from some of the radio stations which since the day I got my ride, were not evident.

My installer did not meddle with the integrated head-unit or the front speakers.
The car's antenna is integrated into the rear screen window.

How can I solve this problem?

Answer
HI
the antenna in the back window uses a antenna amplifier that is behind the plastic  pillar  maybe the installer took the remote out of the radio to turn on the amplifiers in the trunk but this signal is very low and it is for the antenna on the window only,
he needs to get the remote for the amplifier from a diferent source