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Before dealing with the radio and performance issues, let s deal first with a few antenna safety matters You do not want to be hurt either during installation or during the next wind storm Two problems present themselves: reliable mechanical installation and electrical safety Radio antennas are inherently dangerous to erect if certain precautions are not followed It is not possible to foresee all the situations you might face in erecting an antenna I would like to give you all possible warnings, but this is not even possible You are on your own and must take responsibility for installing your own antenna I can, however, give you some general safety guidelines Knowledge of what you face and some hard-nosed, sound judgment, modulated by a little bit of common sense are the best tools on any antenna job
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544 General antenna mechanical construction techniques One rule that is an absolute is that no antenna should ever be erected where the antenna, the feedline, or any part thereof crosses over or under a power line or pole transformer ever! This is a no kidder don t do it Every year we read sad news in magazines or newspapers about a colleague being electrocuted while installing or working on an antenna In all these tragic cases, the antenna somehow came into contact with an ac power line Keep in mind one dictum and make it an absolute: There is never a time or situation when it is safe to let an antenna contact the electrical power lines! This advice includes dipoles and other long wire antennas thrown over supposedly insulated lines, as well as antennas built from aluminum tubing The excuse that the power lines are insulated is hogwash Old insulation crumbles on contact with even a thin wire antenna Don t do it! The operant word is never! Power lines look insulated, but there are often small breaks or weakened spots (especially more than a couple days after installation) that can bring the antenna into contact lethal contact with a hot power line Every year or so we hear about an SWL, scanner/monitor buff, or ham operator being killed by tossing an antenna wire over a power line Avoid making yourself into a high-powered resistor it might blow your life fuse And the same rule applies to situations where the antenna can fall onto a power line if it fails mechanically You have to examine the situation to see if there is any possible way for that antenna or its support structure to fall onto a power line if it breaks in any way whatsoever Figure 28-1 is a diagram of my lot in Virginia A 23-ft mast is erected at the back of the house, and its 23-ft fall radius is plotted It should not intersect either the power lines or the cable TV line, even when it fails and is wind-whipped Note that the antenna could fall over the property line onto the next lot to the rear After consultation with the other landowner and the county mechanical inspector, it was determined that my rear fence is sufficient protection for the other homeowner Because it is technically on my land, the fence damage is my responsibility However, should the other homeowner change his mind or a new homeowner buys the place, then my antenna may have to be moved Another caution is that you must be physically fit to do the work While the onthe-ground portion of the work is usually not too strenuous, any climbing at all, even on ladders, can be taxing Antenna materials are deceptively lightweight on the ground, but when you get up on even a small ladder, they are remarkably difficult to handle Attempting to manhandle a 22-ft vertical once wiped my back out to the extent that I needed 800-mg of ibuprofen three times a day for about a week and I consider myself lucky that the pain hit me after I had dismounted the ladder Besides, if you could see me, you would wonder why a man my size was on any ladder in the first place! Before using a ladder, learn how to use a ladder A lot of homeowners, whether putting up antennas or painting the upstairs windows, fall off ladders that were being used incorrectly There is a right way and a wrong way to use each of the different types of ladder; learn to use them correctly If the wind blows even a few kilometers per hour, the danger is magnified considerably I recall a friend, who is a large, strong bear of a man, attempting to install
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