Is there any advantage to open wire line construction vs the bidirectional coax Beverage that ON4UN describes? RG6 is cheap and strong with a copperweld core or use any other coax from CATV surplus to RG58/59. Some are UV resistant, flooded, etc. The only downside I see is two transformers and two feedlines are required and perhaps a db or two loss for the reverse direction, which really doesn't matter. A plus is no relays. A coax version sure is simpler to build and maintain. Of course coax doesn't have the classic Beverage look ;-)
Anything that can be done with the house feedline on a regular two wire Beverage can be done using coax as an antenna element.
The coaxial line only affects the transformer construction at the Beverage ends, and the terminating resistor.
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