You need to use fm boost after you run the fm transmitter program. You need to run it everytime. If you run another application or take a call you must use the fm boost program. It runs some script that makes the transmitters transmit at its highest power. It is tuned down by Nokia for some reason. Everytime you run transmitter and the signal is weak run the fm boost program. Just place a shortcut on the desktop and after you plug in the car charger, if you use one. The fm boost is the last thing you want to do before you put the phone down. You will see when you need to run it again and when not to. Just try it. It works well in Chicago in the city on the northside to the southside on 98.3. That is the station I use about 90% of the time. Sometimes when around big metal structures you get interference.