For exactly the same reason that you need a choke on a ground plane or
any other antenna feed with coax. sniped

Danny, K6MHE

I agree with the choke needed on a ground plane. But all antennas ?
Sure you can put a choke on a OSJ won't hurt, won't help ether.
Been there, done that.

73 Al Lowe N0IMW

On 12 Jun 2005 16:18:35 -0700, "Al" wrote:

For exactly the same reason that you need a choke on a ground plane or
any other antenna feed with coax. sniped

Danny, K6MHE

I agree with the choke needed on a ground plane. But all antennas ?
Sure you can put a choke on a OSJ won't hurt, won't help ether.
Been there, done that.

73 Al Lowe N0IMW

Allow me to repeat: *ANY* antenna feed with coax should employee a
choke. It is just good engineering practice.

If your beloved open base j-pole is feed with coax that is any
multiple of a 1/2-wavelength you ARE GOING TO HAVE HIGH COMMON MODE
CURRENT!

So just what makes you beleive that your open base j-pole has some
magical properties that is self-decouples itself from the feed line?

73
Danny, K6MHE