I have what I call my reference antenna an MFJ-1800 spec says 15db gain (hmm\n?)\nbest signal is -72dbm to -70dbm.\n\nMy test signal is in a building about 100 yards away.\n\nI built the biquad with 30cm lips my best signal strength is -74dbm .\nwhen I mount the biquad on a 18"x36" offset feed dish (looks like this)\n[URL]http://www.2000networks.com/accessories/dishes_lnbs/dish_directv_international.html[/URL]\nthe best signal I get is -64dbm, a 10 db gain over biquad alone.\n\nIs that the gain you would expect?\n\nI found the original feed position wasn't optimum, I had to raise the biquad\nabout 2"\nand also back it away from the dish about 2" to peak the signal.\n\nWhat is are your thoughts about that?\n\nMike\nPS.\nI question the the MFJs gain because the modified (110mm and lips) biquad\nis only 2 to 4 db less than the MFJ. If I did good, and got 8db gain from\nthe biquad then that looks like 10 to 11db gain for the MFJ. I do understand\nantenna measurements can be difficult. That said, I have used the MFJ-1800\nfor almost a year now and think it is\na good buy at .00 plus shipping.