[Antennas] Balanced line optimum conductor spacing?

[George, W5YR]

Peter, why *bare* copper wire?

Yours is the second posting from Germany which has stressed that open-wire
lines *must* be made of bare wire or "terrible things will happen."

Please explain - I just don not understand . . .

72/73, George W5YR - the Yellow Rose of Texas   QRP-L 1373 NETXQRP 6       
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe SOC 262 COG 8  
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
Icom IC-756PRO #02121  Kachina #91900556  IC-765 #02437

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DF3KV@aol.com wrote:
> 
> Hi all,
> 
> My rule of thumb is to make the balanced line as wide as possible but
> not narrower then wavelength/200 on the highest frequency to be used.
> Also use as few spacers as possible ( best to be avoided by wide spacing
> and heavy pull on the wires ), preferable ptfe.
> Bare copperwire as thick as mechanically  possible is the best.
> With that in mind efficiency will be optimum and losses on the feeder and
> in within the  tuner are at minimum.
> 
> 73 - Peter, DF3KV