[CQ-Contest] Contest QTH
btippett at alum.mit.edu
Mon May 24 04:31:42 PDT 2010
>> While salt water is definitely good for verticals, but it
>> doesn't help horizontally polarized antennas like Yagis.
> Not true. Even horizontally polarized antennas gain from the salt water. Besides enhancement from the ground, reflection conditions in the immediate vicinity of the array, signals at the salt water edge are enhanced regardless of polarization.
EZNEC shows minor improvement for horizontal polarization over
salt water but it's at high angles...not low angles as is the case for
vertical polarization. At 14 degrees TOA, there's a 0.51 dB
advantage, at 7 degrees a 0.26 dB advantage, at 3.5 degrees a 0.16 dB
advantage. The reason for this is that ground conductivity has less
reflectivity effect as the incidental angles become very low.
Isn't this discussion déjà vu of déjà vu?
73, Bill W4ZV
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