W. Watson wrote:

I'll continue to experiment, but so far not so good. Comments?

As others have said, you should try to attenuate the noise at its
source. If it is radiated, you need a better PSU. If it is coming out
on the PCs AC line, line filters might help.

If the PC and KGO are not in the same direction, some sort of
directional antenna might help.

Of course, the ultimate solution would be to move to SF and get a really
big signal. But there are problems with that, too: I live abt 3-4 miles
west of KNX (50 KW, 1070 KHz) and my problem is avoiding it, not making
it stonger

Phil