Here's a "walk" test using Gordon's Mini with the DB transmitter on the roof with a right angle whip. For some reason the sales department had one right angle whip on the DRM receiver module with an LPDA on the other antenna port. So this literally was a diversity system with 1.5 LPDA's or 2.5 whip antennas attached. Also, they used a transmitter frequency that had a high noise floor from local TV stations. So in one sense this was just the sales crew goofing around. The fact that there was an ex-engineer there, lends no credibility to the test.
http://youtu.be/lFTqL8dUD9U
Best,
Larry F
Lectro