Which reminds me that I should have mentioned the available scan of club using a series of yagi antennas around a wide tower to obtain a quasi omni pattern. You can probably find the info on the repeater builder antenna page along with the mounting offset paper I mentioned earlier.
skipp > <[EMAIL PROTECTED]> wrote: > > For a water tower, I would imagine the backside null is rather substantial. A club I was associated with more than 20 years ago tried the side mounting of an 2 meter antenna on the railing of a old style water tower (four legs supporting the "Ball". It performed as expected with deep, very noticeable (on the air) nulls off the back. However, if that is all you can get, then go for it. I have seen guys mount a Rohn 25 type tower on the platform where the railing is, mount the antenna on top of the tower section(s) and then the top of the antenna will see over the top of the water tower. I guess it should work. However. I bet there is a mechanical situation that has to be worked out to insure mechanical integrity during high winds. If you can bolt the tower top to the ball, that would help. I have seen that also. > > Roger W5RD > > >From: Dave VanHorn <[EMAIL PROTECTED]> > >Date: 2007/01/26 Fri PM 12:16:39 CST > >To: Repeater-Builder@yahoogroups.com > >Subject: [Repeater-Builder] Antenna on the side of a water tower > > > > > > >Can anyone point me to something that will show me the antenna pattern > >for a VHF and UHF antenna mounted on the side of a water tank at > >different distances from the tank? > > > >I've been offered a site, but I can't have top mount, I have to go on > >the side. I have the mfgr's docs showing pattern with different > >distances between the loops and the mast, but I don't have any info on > >how the big metal tank reflection will disturb the pattern. > > > >I'm sure there's an optimal distance, but I don't know what it would > >be. > > > > > > > Roger White > Murphy, Texas >
