I just bought a Kenwood 516s and had it installed in my 02 Isuzu Trooper. The Trooper has the antenna integrated into two rear windows. On the factory unit, reception is great. Now, at best, I get fuzzy reception from local stations. There is no reception of stations over 30 miles away. The unit was installed by the store I purchased it at. Does anyone here have any ideas or experienced any other related issues?? Thanks in advance!