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What about that car? Looks like someone is serious about checking signals.
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The two antennas on the car is how I compare the gain of two antennas. I use a stable OTA signal and switch rapidly between the two antennas with an A/B switch and record the signal level readings from my Sadelco DisplayMax 5000 Signal Level Meter.
The two antennas are the new Channel Master 4221HD and the original 4221.
The 4221HD wasn't performing as well as expected because of some design faults. There is a modification thread on the DHC forum.
http://www.digitalhome.ca/forum/186-...are-hacks.html
My post
http://www.digitalhome.ca/forum/1167870-post221.html
My chart of test results:
The second attachment is a larger version of the chart, but I like to limit the width of images that show in a post to 800 pixels; anything wider makes the posts too wide.