prcguy enlightened me about the use of a limiter inline. I currently use the HP 5086-7284 which covers 0-1.8 GHz. I tested the power coming in first without it and no problems as I knew about antenna spacing. Still, I installed them anyways as inexpensive insurance. I definitely use one in the vehicle where my TX antennas are much closer to my RX antenna, even though the spacing is adequate after power testing. I believe I paid $15-$30 on eBay as I have a handful in use. If you monitor up to the 3GHz the 8600 offers, or don't want to fuss with an adapter, there are other brands.
I first recommend reviewing the power coming into your RX antennas from your transmitter(s). You may need a limiter that can handle much more power, as well as the frequency range you monitor and the connector type. They can be costly, but sending equipment in for repair is unpleasant.