Topic: Chumby with RangeMax?

Is anybody using RangeMax? I saw that it was tested by Chumby and is known to work, but I'm interested in if it would make a difference with a microwave oven (1300 watts, if that makes a difference) about 5 feet away from the Chumby, since the Chumby just has a regular 802.11g adapter. If not, would it be possible to plug in a RangeMax USB adapter to the Chumby?

I'll probably get one anyway for the DVR, but it would be nice to know before I void my Chumby warranty :-)