I've mostly been using a discone in the attic so far, but now I want to get proper antennas up for 2m/70cm and gmrs. I'll probably get common commercial vertical antennas. I'm not sure how much I really need to be worrying about them interacting, and since changing placement changes what sort of support system I need, which could change which antenna sizes I can use, I'm unsure about where to start.

So far I've been looking at:

  • GMRS (50W) looks like most antennas are about 5dbi
  • 2m/70cm (100W) - maybe comet gp-6 ? 6.5dbi on 2m, 9dbi on 70cm

How should I arrange these to avoid damaging one radio when transmitting in another?

  • $\begingroup$ Please, describe the antennas you plan to use. This could strongly affect placement requirements. Are you concerned about damage from same-band or cross-band transmissions? What transmit power levels do you contemplate? $\endgroup$
    – Brian K1LI
    Apr 3 at 18:03
  • $\begingroup$ @BrianK1LI I'm assuming same band is more likely to cause problems but I guess part of my question is what do I really need to worry about $\endgroup$
    – Brad Mace
    Apr 4 at 18:07
  • $\begingroup$ Are you concerned with only damage, or is desense / front end overload also a problem you care about? $\endgroup$
    – user10489
    Apr 25 at 15:20

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