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Ultraviolet radiation from the sun does not affect aluminum, but in time, will affect untreated fiberglass. For this reason reflectors contain a stabilizing additive in the resin which effectively eliminates this problem. Throughout history, manufacturers have found a way to create confusion within their markets. Some do it intentionally to overcome their inability to sell their products or services based upon the merits of the product or service. Other manufactures simply ignore the fact that many users of their products have absolutely no background regarding the product and need the most fundamental information from which to build their knowledge base. The antenna industry, by use of vague terminology, has created some confusion too. Two of these areas, "factory pre-tuned" and "tunable antenna", will be explored. industrial activities include raw material extraction to manufacture glass, sodium bicarbonate, as well as sodium silicate and bicarbonate, just to mention some specialized chemicals. (At least WE think so!) The gang at has surfed the web for thousands of hours in search of the best ham radio sites. Here is a list of the best of the best. If you follow these links, you should be able to find the answer to any question you might have --as long as it''s related to ham radio---the greatest hobby on earth! Our links will let you find the answer fast without having to be away from the radio too long. Links to this site are invited and are very much appreciated! If you are a webmaster, or if you have a personal webpage, all we ask is that you link to this main index page, and not one of our side pages. URL''s of the side pages are subject to change, but will always be accessible from this main MGS index page. Thank you! Our contacts and relationships allow us to provide superior product at lower cost than a single commercial user dealing direct with a single factory. Let us quote on your needs! We can research and locate fiberglass products needed for your manufacturing, and in many cases suggest alternate or lower-cost solutions. Quantities for wholesale price breaks can be surprisingly small, and custom colors and lengths are possible as well. Inquire by email or post. Type 1 consists of one 8 ft. length of 1¼" OD and one 8 ft. length of 1" OD round fiberglass tube both having 0.125" wall. The 1" tube snugly-but-easily telescopes in-side the larger tube. Using a recommended 12" overlap yields a usable length of 15 feet...more than enough for 20M!! A foot of this extra length may be easily cut (with a hacksaw) from the 1" OD tube, and epoxied inside the bottom of the 1¼" OD tube. This yields a full ¼" wall thickness(!) at the point of greatest stress...e.g. where the clamps secure the spreaders to the spreader mounting plate-or "spider".
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