darn, i missed the action
oh well, perhaps he also asked this on the 'ZED,........... i'll go check there
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as far as a chain link fence goes, i have found that they can be a really poor ground, the links may or may not actually really contact each other due to oxidation forming and acting as an insulator.
a low mounted dipole on 80 will work fine as an NVIS antenna, just get a reflecter about 3 to 5% longer under it. but,......... for "most" applications, the higher, the better. YMMV