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Old 29-Jul-2016, 12:20 PM   #16
bobsgarage
Antenna Enthusiast
 
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Join Date: Mar 2016
Location: Beach Park IL
Posts: 318
Quote:
Originally Posted by rabbit73 View Post
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.
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.
I see why you did that, you wanted to have absolutely no variables in your testing. Nice set-up and great effort.

Much has been said about the differences between the 4228 & 4228HD, but it appears to me that your 4221HD in most cases, does better than the 4221 even unmodified.

Looks like a late '90's Ciera or other GM shared body.
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