Im trying to listen to a P25 frequency on 851.875 and the only signal I get is from this Radio tower down the road. Its a College FM radio station I think . Its a tall tower with the light ontop and its about 3 or 4 blocks from me and all I hear is this darn thing no matter which scanner I use. Is there a way to block that signal from coming into my scanner. I tried ATT but that cut everything out.