For UHF repeater systems operating around 435 MHz, antenna efficiency and gain are critical. Simple vertical antennas often do not provide sufficient performance, especially when wide coverage and reliable signal strength are required. To address this need, a UHF collinear antenna design adapted from the well-known Diamond BC-200 has been developed and documented by Kostadin Evstatiev (LZ1DJ).
This 3 x 5/8 Collinea antenna is intended specifically for the 420–440 MHz band and provides high gain without requiring post-installation tuning when constructed accurately.
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