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Old 13-Mar-2019, 1:56 PM   #50
Retired A/V Tech
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,639
Solid Signal's claim of a 60 degree beamwidth for the HDB91X is misleading. They are not using the conventional method of calculating beamwidth. Some people will fall for it.
Technical Specifications
Beam width approximately 60 wide (out of 360)

Note that Winegard also uses the -3 dB half-power points to calculate the beamwidths of the 8200U:

You can have an antenna with more gain and narrower beamwidth or an antenna with wider beamwidth and less gain, but you can't have an antenna with more gain and wider beamwidth; the two are mutually exclusive.

Additional gain comes from making the antenna more directional with a narrower beamwidth, which ignores other directions like a searchlight or spotlight. There is no free lunch.
Attached Images
File Type: jpg AD 91XG Spec Data.JPG (59.4 KB, 788 views)
File Type: jpg Winegard HD8200U gain.JPG (66.3 KB, 995 views)
File Type: jpg antenna_beamwidth_diagram_2.jpg (67.7 KB, 796 views)
File Type: jpg HDB91X Field Pattern_2.jpg (116.9 KB, 794 views)
If you can not measure it, you can not improve it.
Lord Kelvin, 1883

Last edited by rabbit73; 13-Mar-2019 at 6:08 PM.
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