Soliloquy wrote:
Any insight into why the scanner antenna would permit normal operation of
the 785D without the problems of intermod being a real nuisance? My
outdoor antenna is identical to the Antenna Craft ST-2 seen (minimally)
here http://www.durhamradio.com/scanacc.htm

Very strange. Obviously your scanner can't handle the strong local
signals picked up by your small "rubber duck" antenna. So obviously
the outdoor antenna is delivering LESS signal to the scanner. You may
be hearing more signals, because the scanner is no longer being
de-sensitized by strong signals.

I suspect you're getting a lot of loss in the feedline.

What type of coax are you using? What length of coax? And how old is
the coax?
If it's a long run of old weather beaten RG-58, that would explain it.

As the saying goes, "Scanners don't need pre-amps, they need
attenuators."

Art N2AH