By Design, Ground plane antennas are best top mounted, but of course its not always possible. That said, I have done a few and have found they tend to be fairly happy if mounting is at least 1/4 wave length away from the tower. See if you can picture this in the minds eye, 2 lengths of conduit, each threaded on one end and each with a "T" connector on the end, the 2 "T"s tied together by a short length of conduit between them (Do this part first, about 12" should be enough) another 12" screwed in the top too attach the antenna. Screw the 2 longer pieces into this when you get on the tower. Mount the antenna and then slide it outwards. Check vswr and if needed play with what makes it the most happy by sliding it in or out. Then tighten down the clamps. I used a total of 4, 2" attached to 4 3/4 conduit clamps attached to the tower legs. It was relatively easy to slide it out to get it happy before tightening it up. I did this over 15 years ago and last time I drove past that area, I could see it was still up there. Even though that company is no longer there. But that tower with the antennas is still there. Makes you wonder if any of that is in use anymore.
Good Luck! -Richard ________________________________ From: Chuck Kelsey <[email protected]> To: [email protected] Sent: Sun, February 21, 2010 8:36:35 AM Subject: Re: [Repeater-Builder] Re: DB-201 Measurements for 6 Meters? First, the DB-201 was not designed for tower side-mounting, so don't expect it to work well. That said, how far away from the tower will the antenna be? There's a real good chance that the VSWR will go sour when it's side-mounted. However, I have no personal experience with that antenna, but in all the low-band installations around here, I've never seen that antenna side-mounted. Chuck WB2EDV ----- Original Message ----- From: "Tim Ahrens" <tahr...@swtexas. net> To: <Repeater-Builder@ yahoogroups. com> Sent: Saturday, February 20, 2010 11:59 PM Subject: [Repeater-Builder] Re: DB-201 Measurements for 6 Meters? > Thanks Norm & Skipp - I'll do some cutting tomorrow. > > Any clue what the pattern might be hung off the side of > a wide spaced tower? (triangular & about 15' between > legs at the height the antenna will be). > > Thanks again! > > Tim W5FN > >
