Some Melon wrote:

We borrowed a frequency meter, and went around the house with it, but are unsure how to use it effectively. It doesn't have a signal strength meter, so I'm thinking that if a bug is broad- casting the meter should just stick on that frequency?<

You mean frequency counter. It counts the Hertz of the local strongest signal. You need a spectrum analyzer, which shows you signal strength vs. frequency. And you need to worry about intermittent ('burst') bugs. And WTF is an 'infinity' transmitter?