[dtvmcdonald]

I finally found two ways to get rid of interference from other apartments in my
building and the power line.

1) For LW, BCB and up to about WWV at 2.5 MHz, loop antennas.

2) For BCB to 30 MHz, an outside wire antenna, 25 feet long (noncritical) draped over
a tree from my balcony, and as counterpoise a good, solid connection to the
balcony's metal railing, which is large and not grounded. This is connected to radios
inside with top quality RG-6. However, the commercial F-connector attachment
points are an Achilles' heel as they are not soldered on.

#2 has the problem that the antenna does not match the coax except at
a couple of frequencies, ruining reception strength. This was fixed by adding
a 2-transistor emitter follower with built-in anti-FM radio filter, right at the
antenna-balcony junction. This has a 6kohm input impedance. Its powered by
a 9 volt battery (transistor radio batteries don't last long. I use 6 D cells.)
The results from this antenna are very good.

Please ... no comments about "you must ground the antenna".
THAT DOES NOT WORK! The noise returns. Its grounded through the
coax, and the wire is retracted when not in use.