30 meter Door Frame Loop
This is a bidirectional medium to DX range antenna for 30 meter band (10MHz). The gain is 6.8dBi at 30 deg takeoff angle.

The shape has been adjusted to provide direct 50 ohm feeding with good SWR

Note 1. The dimension in parenthesis are for PE insulated wire eg "Killu".
Note 2. A common mode choke balun is recommended in the feeding point.



 
Antenna model                                                                                                3D radiation pattern plot (see also directivity plot at 30 deg here)

  Elevation plot                                                                                                 SWR

You can put this antenna higher to get even better gain and lower angle radiation. See this elevation plot at 4 meters higher.

Update 2022-10-09 OH7SV

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