Distance between Two UHF/VHF Antennas

[DOCSGMRS]

I’m installing two antennas on top of my RV.  One will be dedicated to GMRS mobile radio and the other to a Uniden  BCT15X scanner.  I have a 15 inch ferrous metal sheet ground plane installed on top.  I’d like to use a mag mount for both antennas and put both on the ground plane on opposite sides.  Additionally, both antennas are unity antennas.  I’m trying to minimize putting any more holes in the roof ... I have an a three cable coax entry which will accommodate coax for my satellite antenna and two radio coax.  I’ve distanced the satellite antenna to allow for an unobstructed view.  I welcome any comments, observations, and advice!

[gortex2]

Id try to keep the antennas 16 inches apart. On my Motorhome I removed my AM/FM and installed a NMO mount there with a Larsen mutliband antenna. I then use a diplexer to pull UHF and VHF to each unit. For my scanner I just used a glass mount. 99% of the time i am listenign to the local P25 trunking system anyway. On my ladder is my Larsen fiberglass stick for my GMRS repeater. Its about a foot high so still lower than my SAT dish.

[DOCSGMRS]

KB2ZTX ... thanks ... I’m going to distance the antennas beyond the ground plane.  I’ll do something similar to what You’ve done.  I have a single antenna to cover the scanner which will use the ground plane and I’ll put the GMSR antenna on the side along the top rail ... just have to be careful! I also have a 140/440 HT that I want to hook up to an external antenna when I’m not packing it around but this one will not be a permanent install ... thanks again, it’s always good to bounce ideas off someone else!  BTW, I need to look at using a diplexing capability for other scanner capabilities.

KC3IDS