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On 2015-01-18, Bruno wrote:
pain. My options are now very limited. I'm in a bungalow with a roof apex height of 18 feet and I'm not allowed to put up anything much above this roof line it transpires, so inverted vees that need to be mounted high up 1. You might want to take a look at Ian Poole's "Practical Wire Antennas". He is English and quite a few shorter antennas for use in the English back gardens. 2. Also this might give you some ideas: http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=28612 3. Having given those two, I've been very successful on portable and in backyard with an end-fed half wave wire. You will need a separate wire for each band, but the 40m wire (abt 67ft) will work for 20m as well. If you need 30m, just put up another wire. The reactance of the half wave wires is about the same (3000-5000 ohms) and can be tuned by any tuner capable of those impediances. I built (see website in signature block below) a tuner for half waves which is toroid based and one cap in parallel. You only have the one cap to tune since about the same reactance for each band. Now the best part: with end fed half waves you only need about .05 wavelength for the counterpoise, or about 7ft for 40m. Thin wire will be noticed by no one, especially if dark in color. ![]() Hope these suggestions help. ....Edwin __________________________________________________ __________ "Once you have flown, you will walk the earth with your eyes turned skyward, for there you have been, there you long to return."-da Vinci http://www.kd5zlb.org |
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