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![]() All hands Let me start over. I want a transportable, six meter, vertically polarized antenna. The parts have to be readily assembled& disassembled. I would like it to have a somewhat higher than normally attempted radiation pattern for use between buildings, hills, ridges... [I had thought that a J-pole might be a good compromise instead of antennas with a more horizontal gain pattern.] It would be really golden if the adding of additional parts would change the pattern back towards the horizontal to use the antenna when it is located above local horizon. Parts should be short enough to fit in the foot well of the back seat of an ordinary sedan. It's a stretch but If it did not need guying that would contribute to ease of deployment especially in an urban operating location were the anchoring possibilities for guy lines may be limited. [I'm trying to devise an X frame tripod. It would be made out of fiberglass structural channel in order to lower the weight of the tripod assembly but that is not an antenna design problem.] I may need the antenna to be elevated when operating near pedestrian traffic to reduce the risk of RF contact or excessive exposure. Shielding the feed point from physical damage; such as by having it inside a piece of Box channel would be quite desirable. I'll leave it there and see what folks can think of that might work. -- Tom Horne, W3TDH Regarding the higher than normal angle request, either 1) make it fairly short so as to approximate an isotropic radiator 2) make it a significant amount longer than a normal J pole so you get lobes above the horizon. You will need to model this for each concrete or natural canyon you expect to be in. And then think a lot more. Possibly a different solution is better. Different band to start with. I don't know, just trying to stir up your thinking. tom K0TAR |
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