Thread: Rca ant751
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Old 28-Apr-2018, 2:43 AM   #87
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Join Date: Aug 2017
Posts: 1
The gain and polar pattern for the Winegard HD7000R can be found in solid signal dot com under product info tabs >Downloads>Download Product Manual. I post the primary info below....

The HD7000R is very similar to the ANT751 (almost identical to the revised ANT7511 with following exception). It has four aerial extensions you can add to the VHF section to add coverage Low-VHF. As stated the RCA ANT751 was made by Winegard. The HD7000HD has a single piece boom like the original ANT751 (but no longer it has been divided into two to make for a smaller shipping/retail package). The mast mount is not on very back end off the boom like the original ANT751 but forward of the last two VHF aerials (like I think the ANT7511 is).

Net Weight 2.36 lbs.
Active Elements 10
Boom Length 32.75
Turning Radius 52.2
Maximum Width 100" (with aerial extensions on for low VHF)
Vertical Height 3"
Element Diameter 3/8"

CH.2, CH.4, CH.6, CH.7, CH.9, CH.11, CH.13, CH.14, CH.32, CH.50, CH.69
dB gain over reference dipole
0.2, 1.8, 0.5, 5, 5, 5.3, 4.1, 3.6, 5.1, 6, 6
beamwidth at half power points
83, 82, 78, 51, 66, 48, 33, 75, 54, 40, 43
front-to-back ratio
1dB, 3dB, 8.5dB, 12dB, 12.5dB, 4.5dB, 7dB, 10.5dB, 14dB, 11dB

Polar Plots
Chan 2-5 it is a figure eight front to back. The back lobe gets slightly smaller going from Chan 2 to 6. This is a pure dipole pattern.

Chan 7-13 Typical Fwd gain lobe, Back side either 3, 2 or 0 small lobes. Ch 13 has some side gain and one medium back lobe.

Chan 14--51: Going from 14 to 51 there is primary Fwd lobe going from wide to diminishing width. On back side it goes from smaller and smaller dual lobes at 135 degree and 225 degree.

I think the gain is low but more than adequate for a "urban" antenna with stations w/I 30 miles. The original RCA751 should be slightly better. My understanding is the new RCA7511 lost a little performance.

My original RCA751 gets LP (7.5KW) stations 9 miles out. That is similar to getting a flame thrower station at 30 miles. I have some obstacle issues (ridge, trees, high roof lines) to deal with and my experience is only TESTING. I had it on my "test stand" 18 feet in the air near my backyard tree line. It's going further away from the trees and up to 40 feet above ground. As of now I was getting SNR of 21-32 on all stations, including the lower powered stations. I actually have TWO ANT751's, which I am stacking. I have a nearby PBS station which is about 100-110 degrees off the primary direction for all other stations. The RCA pretty much NULLS PBS despite being close. No matter how much I play with direction I can't get low powered stations (which I watch) and PBS. Stacking two and combining I got great results on all stations. The dual stack test at 18 feet AGL was a success. At 40 feet above ground, further away from trees, I should be golden. Will raise the mast next weekend I hope. I have a new rotor but will save that for a SWL loop antenna... Rotors are great but to be avoided.

Last edited by gmcjetpilot; 28-Apr-2018 at 3:02 AM.
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