Hi Mark,
Having many of those antennas especially the DB408 450-470 antennas using them in combining system. We always would make a slot for the hams to combine in with the commercial stuff at the same time when we were building the combiners. Yes they will work and you may notice a few watts reflected power. Keep n mind that when using that antenna at a repeater site. You will notice you will have electrical downtilt and that will make your signal better at the base of the hill as well getting the signal down into town rather than a non commercial antenna. I know of guys using those antennas and they don't last vedry long like the commercial antennas do. Also the pattern on the Diamond/Commet antennas are a bit out of wack compaired to a real antenna. Im sure that mostof the commercial operators would agree and recommend a gook known antenna on there towers. When you drive to a site and see a bunch of ham Diamond and Comet antennas its not well respected in the tower community of site owners. Mike Mullarkey (K7PFJ) _____ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Willis M. Hagler Sent: Friday, June 06, 2008 3:57 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] antenna suggestions for 440mhz Hi All, Does anybody have experience running the DB 404/408/420 type antennas down around 440.000mhz transmit? The 'B' version of these antennas is manufactured for 450-470mhz but I know they operate nicely just below 450 in the ham band. I have a repeater running now with a Diamond X-510 antenna and the signal flutters a bit when the Diamond flops around in the wind so I'm looking into a stiffer, non-fiberglass antenna. I like the DB's but unsure how bad the 450mhz matches when trying to use it down at 440.000mhz. Any other suggestions for a omni UHF antenna that will play well in the low end of the 440 repeater band with 10-12db gain? Thanks, Mark Hagler W7WMH Seattle
