Looking for advice on antenna placement for our radio club repeaters.
|
Out club has a 55 foot tower on top of a high point in our county. We are in the process of upgrading the feedline and replacing the antennas. Our coverage for the current 2M/440 antenna at the top was excellent before we had feedline issues. We also currently have a Comet CX-333 tri band antenna side mounted on the tower. The base of CX-333 about 16 feet below the top of the tower. It has had decent coverage on 220 in the past but has recently degraded the last year. It will only be used for 220 operations. The reason for the tri-bander is that it has served as a backup antenna for the top 2M/440 currently and in the past due to antenna / feedline failure.
?
The club is adding a GMRS repeater to the site and the main question I have is, what is everyone¡¯s opinion of side is mounting a Comet CA-712EFC directly opposite the 220 Tri bander. ?Both standoffs are around 2.5 ¨C 3 feet off each side of the tower.
?
Also is there a rule of thumb on how much separation I should have from the top of the two side mounted antennas to the base of the top antenna?
?
This is what I have for the install:
Top of Tower - Comet GP-9 GP9N 2m/440 fed with 7/8 superflex ¨C 25 watts
Side Mount - Comet CX-333 (Used for 220Mhz) fed with 7/8 superflex ¨C 10 watts
Side Mount - Comet CA-712EFC (GMRS) Fed with ? superflex ¨C 25 watts
?
Thank you for your time!
|
