02-18-2008, 08:55 AM
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Join Date: Apr 2005
Location: Nova Scotia,Canada
Originally Posted by freecell
"10 to 14 dB signal increase in transmit with 90 degree rotation"
that's some funny stuff.
What's so funny about it? It does not say the antenna exhibits that much gain. A rotatable dipole will do at least the same thing. Orienting the antenna null towards a station and then rotating it to a peak,even if that peak is down from a dipole, should show a differance of at least 10-14 dB.It is comparing relative losses,not true gains.My external tuned ferrite bar antenna will show better than 30 dB signal increase with a 90 degree rotation on the AM
broadcast band. Not bad for an antenna 10 inches long on a wavelength of 200m or more.
It's all about the nulls not the gains.