It is a centre-fed broadside array antenna, based on the Franklin Antenna It has high gain but a very narrow focus beam You will often find these antennas on mobile phone masts in an array setup of 6 or more. ¼ wave 12.93mm ½ wave 25.86mm Back Reflector 35mm by 240mm http://en.wikipedia.org/wiki/S...By: andrew mcneil
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