160MHz Ambient Office Noise?
Shouldn't be too hard to find the source, move the antenna closer and farther away from potential radiators of EMI. Or shut each source off and see if it is the offending source (I don't have a tent, I was in a lab with some noise from 70-700MHz affecting our instrumentation only once or twice a month, we never found the source, it might have been external).

All commercial devices should be FCC certified (or European equivalent) then that means that it is acceptable. If you have one that is not certified then that could be a good source. 

Many FPGA's and microprocessors have clocks in the 50-500MHz range (some even above that) so it isn't unreasonable that there is RF noise in this frequency range.