A bigger problem would be getting the impedance matched with a harness since the dipole feed point impedance when mounted on a pipe or tower is difficult to know without having measured it. Getting a desireable radiation pattern is important but not having the dipoles impedance matched to accept the RF is paramont. WA9ZZU
--- On Thu, 3/4/10, Chuck Kelsey <[email protected]> wrote: From: Chuck Kelsey <[email protected]> Subject: Re: [Repeater-Builder] Low Band DB-212 antenna questions. To: [email protected] Date: Thursday, March 4, 2010, 10:25 AM Although I've never done a back-to-back, I read that it can be done that way. You should see pretty much omni coverage, but no gain. To get gain, the elements need to be spaced along the tower between .85 and .95 wavelength, center to center. Chuck WB2EDV ----- Original Message ----- From: "Wayne" <wa5...@cablelynx. com> To: <Repeater-Builder@ yahoogroups. com> Sent: Thursday, March 04, 2010 10:54 AM Subject: [Repeater-Builder] Low Band DB-212 antenna questions. > Has anyone had any experience with DB-212 low band type loop antennas > mounted back to back at the same elevation on a mast or tower? What type > of pattern did they have? How did they compare with a ground plane? Would > it be better to use one loop instead of two at the same elevation? If the > loops can be separated what is the minimum for 52MHz? > > Wayne, WA5LUY >
