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100' equals 70dB of attenuation. So, that means your microwave is leaking about 20dBm.

How about shielding? If the microwaves can be located next to each other, I'd build an enclosure to shield them. One would think that any leakage would originate from the door so shielding may not work well. However, if you have a friend in the medical or dental field it would be neat to see how much, if any, one of those x-ray lead shields would help.

The more I think about it, I think that shielding would be very cost effective and would solve the problem. Finding different microwaves could be the answer, but if they swap out a micro in a year you could be back in the same boat.

GT