The antenna he is trying to tune is designed to use horizontal radials. The matching coil in the base of the antenna shunt feeds the vertical element and provides a 50 ohm match. Sd
--- On Mon, 8/18/08, Ralph Mowery <[EMAIL PROTECTED]> wrote: From: Ralph Mowery <[EMAIL PROTECTED]> Subject: Re: [Repeater-Builder] Re: Low Band Base Antenna Info Wanted To: Repeater-Builder@yahoogroups.com Date: Monday, August 18, 2008, 5:18 PM > Also I remember there is an optimum angle to > "droop" them to get the > main lobe at the horizon-I want to say between 30 and 45 > degrees down > from horizontal. Affects impedance too if I > remember...it' s late.... > > > The ground plane elements are usually drooped about 45 deg to get the impedance to around 50 ohms. It is around 36 ohms if left horizontal.
