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Is the "horn reflector antenna" a kind of periscope antenna? The horn reflector antennas are popular on the telephone microwave radio relay towers in the US. Alas, all the relay tower photographs I see in Wikipedia today (mostly in Germany) seem to have some other kind of antenna; I'm guessing a "delay-lens antenna". The "horn reflector antenna" is briefly mentioned in the Harald T. Friis article. The AT&T microwave radio relay station at St. Libory, NE has 6 such antennas that you can see in the photographs at the "long lines" page. --68.0.124.33 (talk) 03:28, 13 September 2009 (UTC)