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Ian White GM3SEK wrote:
ferrymanr wrote: Remember that this has to be a 'stealth' antenna as I live dead center in the town with a lady councillor opposite, the town council office 75 yards away and town hall about 150 yards away. This rules out low loss copper pipe etc. Most of the small 'magnetic loop' antennas are intended for vertical use which would also stand out like a sore thumb here. It's surprising what can be done, with a bit of determination that you *are* going to get on the air. I know a ham who lives in a Listed building, which means he can hardly even paint a door without consulting the local Council's Conservation Officer. To make life interesting, he lives right next to the Council offices, and there's a perfect view into his backyard from the Conservation Officer's desk! Now that's what I'd call really living with restrictions... yet he has still found ways to get out well on 80m. (His antenna would be very unlikely to suit your situation, so there's no point in describing it in detail.) Always remember that you have rights too. With certain exceptions, most UK householders have the right to put up a garden shed without asking anybody's permission at all. A surprisingly large shed, too - with a pitched roof, the ridge could be up to 4 metres high. Check how that would apply to you. And then, if anyone objects to you using a 4m high vertical loop, ask them if they'd seriously prefer that you build a whole big shed around it? The advantage of the wire loop is that many buildings here have wire around the roof to deter seagulls, that means my wire would not be conspicuous. That would certainly be another option to explore; but whatever you do, be sure to make the best use of all your rights. I would transmit on an efficient short vertical, and use a magnetic loop on Receive. For that matter any low noise receive antenna like a Flag or K9AY. I would also look at something like the Welbrooke Active loop. I wont get into the debate of "magnetic" and noise! Just go to Welbrookes web page and read some of the reviews from a EMC expert on noise and comparing the Welbrooke to 20,000 Dollar R&S EMC antennas E and H plane antennas. If W8JI and others can work DX on 160meters from an efficient mobile antenna, you should have no trouble getting out. There was a guy on 80 meters from the west coast K6MB who used to beat stations with dipoles in the 80 meter DX window with a coil loaded mobile antenna! Dont believe all the high angle low angle nonsense, the difference in real terms amounts to one deep fade. I would never feel at a disadvantage running a vertical versus a low dipole. There was a interesting article in QST by Some PA hams who used a R&S super resolution DF antenna and measured incoming arrival angles across Europe, oh how i would like to have one of those setups! They use cross loops too. Zen |
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