Antennas in the attic

I have a strict Home Owners association, and have to mount my antennas in the attic. I currently have home made UHF/VHF antenna mounted in there and have no problems. I also have a two meter/70cm vertical antenna mounted in the attic. both are about 10 feet apart. Now i am getting ready to span the length of the attic with an end fedz 20 meter antenna. This antenna will be strung from one end to the other in the attic and will pass within 1 to 2 feet of the 2 meter antenna. Now i doubt that i will be transmitting on both at the same time, but may be monitoring one and transmitting on another. My whole concern here is with RF from one antenna affecting the other enough to damage my radio equipment on the other end? Do i need to be concerned?

Thanks,

Myron - KZ4N