How sharp does the notch need to be? Those PAR filters are all nice and stuff, but at 30 db down, that notch is about a MHz wide. Don't expect to notch out wx and still listen to railroad traffic at 161 with one of those.got one of those damn kW NOAA sites in town. it's tearing up the entire VHF band on my BC780 and BCD396T.
need a good home brew notch filter design for 50 ohms at 162 mhz.