In article ,
Glenn S. wrote:

Another thing that's got me wondering if it is affecting the
radiation pattern is that fifteen years ago, I didn't have the TV
antenna under the Antron, and the neighbors whined so much about
hearing me in their telephones that I put all my CB stuff in the
attic. Now, I've put the exact same equipment back up two weeks ago,
with the addition of the TV antenna, and I haven't had one complaint.
Could the TV antenna be affecting my radiation pattern?

RF can get into cables and equipment, and if there are nonlinear elements
like diodes or transistors or a corroded connection, they can act upon
the transmitted signals to create new signals and harmonics.

One time I was having huge problems with medium wave broadcast "intermod",
where all over the dial there were mixtures of two or more of the local
AM stations. It turned out to be a corroded connection on the FM antenna
for the hi=fi tuner. So a system designed to receive 100 MHz signals
was picking up 1 MHz signals, and spewing them all over 3-30 MHz range
to a receiver that had no connection with the source.

Figure that any long piece of metal within 100 feet of your transmitting
antenna is going to pick up (and reradiate) your signal, affecting
your transmission. And if it's not a very good piece of metal it can
do strange things. Roof flashing, railings, masts, guy wires ...

Also, if you have a TV signal booster on the antenna, it's getting
hammered with quite a bit of signal.

Mark Zenier Washington State resident