In the latest QST there is an article on a Window line twin lead antenna
that uses relays to switch sections in and out of a dipole configuration
to allow multiband use. (DC is inserted into the coax to activate the
relays.)

Sounds interesting to me.

But...the twin lead is connected directly to coax with no balun. Isn't
this a mismatch? I wonder about significant RF coupling to the adjacent
dipole sections through the relay assemblies. Also, I couldn't tell if
the window line was shorted into a loop at the ends or not.

Any comments?

Thanks

John
AB8O