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The dish is not big enough to mimic a ground plane and produce the 1.2:1 SWR. You can be sure the coax and or the mast is acting as the counterpoise to reach the match. I would also expect maximum signal to occur off to the sides and not the dead front of this dish. The back may be the weakest signal but the front is not going to be the strongest. Check it again and you'll find there are two spots, one on each side that show the highest signal. Not one high spot right in front.