The electron gyrofrequency (1.6 MHz or less) causes 160 meter signals propagating more-or-less east-west at mid-latitudes to strongly favor vertical polarization.
80 meter propagation only slightly favors vertical polarization for more-or-less east-west propagation at mid-latitudes. Other factors such as ground reflection efficiency in the Fresnel zone are much more significant. The gyrofrequency doesn't affect horizontal or vertically polarized signals at 7 MHz and abovc. 73 Frank W3LPL ----- Original Message ----- From: "K4SAV" <radi...@charter.net> To: topband@contesting.com Sent: Friday, December 11, 2020 10:17:39 PM Subject: Re: Topband: Low Dipoles Saying 160 propagation is complicated is an understatement. Otherwise someone would have already figured this stuff out. One other contributor that has to be added to the mix is the effect of Earth's electron gyrofrequency,. NEC knows nothing about this effect. It's also a function of where on this planet you live Some people get the benefit, other don't. Antenna polarization is important when interacting with the effects of Earth's gyrofrequency,. Jerry, K4SAV _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector