On Wed, 6 Apr 2011 03:56:21 -0700 (PDT), "
wrote:

Let's say I build a horizontal dipole, trimmed for minimum SWR @
7.200 mhz. I'll probably use 14-16 gauge insulated house wiring for
this antenna. It'd be a "nominal' quarter wavelength per leg.

This dipole will be fed with 50 ohm coax, and it will be erected
horizontally, 30 feet high over "average" ground.

What SWR reading could I expect to see from this antenna if I tried
to use it at 21.300 mhz........in the same environment as stated
above?

Thanks, folks......

FjLee KA0FPJ


Just put it up and see what happens.

Slap a tuner in the line.

Or check out a fan dipole.

Or buy a pair of 15 meter traps and use the design sheet that comes
with them to build a 40-15 trap dipole.
http://www.unadilla.com/?p=34