RF in the Shack

[W9JEF]

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I also lived in a third story apartment (but had no access to the roof).
I end fed a quarter wave wire on 80 meters against a counterpoise.

To effect a low impedance ground on 10 meters,
try connecting an 8-foot wire to your station ground,
with the other end extended clear of conductive material
(as if it were an antenna).