[Milsurplus] mf antennas etc.

[Raymond Cote]

Right on black PVC absorbing rf.  Just put the plastic you desire to use in a microwave and see it it heats up a bit.  If it does, don't use it.  We always used white PVC  for the cross arm on our dual crossed yagis 11 element beams for satellite work and worked FB.

Ray 
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 P.S. If you wind loading coils on PVC, use white.
 Black PVC has something in it-
 probably carbon black- that introduces losses.
 And at high power, it heats up, too.
 Don't know about the gray stuff.
 Unless you want low-Q (for greater bandwidth),
 can make-up the losses and you're not going 
 to melt the stuff, stick with white.
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