[Boatanchors] How much is too much?

[Jack Antonio]

Subject is concerning power levels into a receiver, not
prices on eBay.

I am looking at putting up multiple antennas at my QTH, for
multiple radio setups, and am wondering if RF into one
antenna may damage a receiver on another antenna.

As a test, I hung an 80 meter inverted vee, with the centers
  separated by about 10 feet vertically and 3 feet horizontally
  from the regular station antenna. (these are eyeball measurements).

100 watts into antenna A(+50 dbm) results in +34 dbm from
antenna B, as measured on a spectrum analyzer. Just slightly
over 2 watts.

This seems like too much for a receiver to safely handle, but what
is a safe value?

Thanks

Jack Antonio WA7DIA/4