"Howard" wrote in message
om...
Hello to all,

I have looked with interest at the new Ten-Tec Vee Beam Terminated
antenna. Is there a guru on the list who has the knowlege to share on
how to duplicate this antenna?

It is a vee beam with each leg terminated to ground with a resistor,
and there is a balun of sorts at the input.

I remember an antenna similar to this years ago, and I think ten-tec
will have a winner with this if folks can get away from the supposed
"horror" of a terminated antenna.

Details at www.tentec.com

It's just a half-rhombic, but must suffer seriously from the poor grounding
that the ground rods provide. That will both reduce the front-to-back ratio
and make the input impedance vary (much) more with frequency.

A real unidirectional rhombic has the single terminating resistor directly
between the two sides, and needs no ground.

Does this terminated V have about the same gain as a rhombic the same
length? I suspect so. The rhombic would require four tall supports - a
clear disadvantage.

Rhombics were used at VHF years ago. The 1950s NBS (now NOAA) Cedar Rapids
(IA) to Sterling (VA) and Longbranch (IL) to Boulder (CO) scatter links on
49.8 MHz (or nearby) used 600 foot long rhombics. Really strong Es allowed
lighting a small lamp directly from the receiving antenna - the transmitter
ran 20 kW, IIRC.