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Message: [QUOTE="MrPogi, post: 128097, member: 5542"]It is, I believe, one of many variations of the U-100 produced by Radio Shack. Check this page <a href="http://www.rocketroberts.com/cm4251/cm4251.htm">Channel Master 4251 Tribute Page</a> - you will have to scroll down to the Other Classic Antennas! headline near the bottom of the page. It appears that the 2 antennas that were given to me were older U-100 antennas of varying vintages, judging from the 2 photos on this page. The "r" at the end I believe means "revised" or re-design. The larger U-120xl I has 14 reflector elements. And looking at the U-100 drawing again, it appears Radio Shack used the same drawing in both the U100 and U120 manuals.[/QUOTE]