Pierre,

Unless you have a transformer nearby, the powerlines won't necessarily be
the cause of the hum you mention. They can certainly cause noise, when
something is loose or dirty. But not usually a hum.

Use a portable SW radio to track it down. Walk around with it to see if the
hum gets louder or softer.

Mark.


"Pierre Vachon" wrote in message
. ..
Hi there, I am trying to build a longwire antenna for use in the 20 meter
band to 70 meter band area. I was looking for advice on what materials to
use for the antenna and the lead in lines. I will hook it up to a Drake
r8B
radio. What is the minimum height it has to be? Where to ground it?.
Actually, does it have to be grounded if the radio is grounded at the
outlet?

I am a little limited in space as my yard is only 75 feet long and there
are
power lines at the front. I assume that they are the source of an
irritating
hum on the receiver on certain frequencies.

Thanks for the help in advance.

Pierre