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a 26-element television all channel rotatable antenna on the roof of his two-story beach house He wanted to be able to pick up Richmond, VA; Norfolk, VA; Washington, DC; and Baltimore, MD, on television, plus scanner bands, from his beach house on the Chesapeake Bay The antenna was handled easily with one hand on the ground and with no wind blowing But up on the roof, it was a different story! Big Al was on the peak of the roof when an off-shore gust of wind came up suddenly and caught the antenna It acted like a hang glider and pulled Al off the roof, plunging him down two stories to the patio below He fractured his pelvis and busted a leg Two months of orthopedic casts and a year of physical therapy followed not to mention lost wages Expensive TV antenna, I reckon Be careful! One good rule is to always work under the buddy system Ask as many friends as are needed to do the job safely, and always have at least one assistant, even when you think you can do it alone Always use quality materials and good work practices Antennas, being potentially dangerous, always should have the best of both materials and workmanship in order to keep quality high It is not just the electrical or radio reception workings that are important but also the ability to stay up in the air and be safe When planning an antenna job, keep in mind that pedestrian traffic in your yard possibly could affect the antenna system Wires are difficult to see, and if an antenna
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546 General antenna mechanical construction techniques wire is low enough to intersect someone s body, then it is possible to cause very serious injuries to passersby In the United States, even when the person is a trespasser (or even a burglar!), the courts may hold a homeowner liable for injuries caused by an inappropriately designed and installed antenna Take care for safety not only of yourself but also of others Consider a typical scenario involving a four- or five-band trap vertical antenna (Fig 28-2) It will be 18 to 26 ft tall, judging from the advertisements in magazines, and will be mounted on a roof or mast 12 to 30 ft off the ground Consider the case of a 25-ft-tall trap vertical installed atop a 15-ft-high telescoping TV antenna mast The total height above ground will be the sum of the two heights: 15 ft 25 ft 40 ft The tip of the vertical is 40-ft above ground level You must select a location at which a 40-ft aluminum pole can fit and fall This requirement limits the selection of locations for the antenna If this is done, then a wind storm cannot result in a shorted or downed power line if the antenna falls over When installing a vertical antenna, especially one that is not ground-mounted, make sure that you have help It takes at least two people to safely install a standard HF vertical antenna, and more may be needed for especially large models If you are alone, then go find some friends to lend an arm or two Wrenched backs, smashed antennas, crunched house parts, and other calamities simply do not happen as often on a well-organized work party that has sufficient hands to do the job safely The second issue pertaining to installing antennas is old-fashioned mechanical integrity Two problems are often seen First, you must comply with local building
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Antenna erection safety 547 codes, regulations, and inspections The local government has a reasonable interest and absolute right to impose reasonable engineering standards on the electrical and mechanical installation of radio antennas The second issue is that it is in your own best interest to make the installation as good as possible Consider the local regulations as the minimum acceptable standard, not the maximum Both these mechanical integrity issues become extremely important if a problem develops For example, suppose that a wind or snow storm wrecks the antenna, plus part of your house Your insurance company may not pay off if your local government requires an inspection and you failed to get one Make sure that the mechanical and/or electrical inspector (as required by the law) leaves a certificate or receipt proving that the final inspection was done It could come in handy when disputing the insurance company over damage A quality installation starts with the selection of good hardware for the installation Any radio-TV parts distributor who sells TV antenna hardware will have what you need in most cases I used Radio Shack standoff brackets, ground pin, and a 19ft telescoping mast in one installation Wherever you buy, select the best-quality, strongest materials that you can find Opt for steel masts and brackets over aluminum, no matter what the salesperson behind the counter tells you Keep in mind that although salespeople can be knowledgeable and even helpful, you, not they, are responsible for the integrity of the installation Local government One necessary reminder is that your local government might have some interesting ideas legal requirements, actually concerning your antenna installation The electrical, mechanical, and zoning codes must be observed There is a great deal of similarity between local codes because most of them are adaptations (even adoptions) from certain national standards But there are enough differences that one needs to consult local authorities Indeed, you may need a license or building permit to install an antenna in the first place One problem that SWLs and scanner/monitor buffs face in the United States is that their antennas are not protected by the Federal Communications Commission, as are ham antennas Local governments have limited rights to regulate ham antennas only reasonable mechanical and electrical standards can be imposed It may be illegal for you to install any type of antenna Save all paperwork regarding your building permit, including the inspection certificates, decals, letters or papers, and the original drawings (with the local building inspector s stamps) If a casualty occurs, then your insurance company may elect not to pay off if you have violated an electrical, mechanical, building, or zoning code This advice may be overlooked by an enthusiastic antenna builder, but it could prove to be a costly oversight if something bad happens In some jurisdictions, there might be another limitation on antenna location Some local governments have a requirement that the antenna be able to fall over and land entirely on your own property About 30 years ago, a Maryland county required that antennas be installed double their own length plus 50 ft from the nearest property line until a local ham radio club sued on grounds that about 9999 percent of the rooftop TV antennas in the county were noncompliant In one humorous scene, a group of amateur radio operators went down to the county offices and asked for about 50,000 complaint forms They filled out several thousand against homeowners
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548 General antenna mechanical construction techniques with TV antennas before they were stopped by the county officer Before installing any antenna, check with the local building codes!
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