31 Meter SWL Wire Antennas



Center Frequency:		 9.750 Mhz	 28.77 Mhz 3rd Harmonic
Halfwave in space is:		50.46 feet	34.31 coax|41.38 twinlead
Quarterwave in space is:	25.23 feet	17.16 coax|20.69 twinlead

Quarterwave Vertical is:	24.00 feet	28.26 foot ground radials
Five Eights wave Vertical is:	61.85 feet	24.00 foot ground plane
Three Quarter wave Vertical:	74.46 feet	12.00 foot eighthwave

Halfwave Dipole/Vertical is:	48.00 feet	24.00 one side.
Halfwave Reflector is:		50.40 feet	45.84 for Director
Low Mount Halfwave is:		46.97 feet	23.49 one side.
Halfwave Folded Dipole is:	47.38 feet	23.69 one side.
Halfwave Inverted V is:		49.74 feet	24.87 one side.
Colinear Array is:		98.46 feet	49.23 one side.
Extended Double Zepp is:	123.69 feet	61.85 one side.

Fullwave Quad Loop is:		104.62 feet	26.15 one side.
Reflector|Director:		109.85|99.91	27.46|24.98 one side.
Fullwave Delta Loop is:		104.62 feet	34.87 one side.
Reflector|Director:		109.85|99.91	36.62|33.30 one side.

Waves 1:  98.46 |1.5: 148.92 |2: 199.38 |2.5: 249.85 |3: 300.31 |4 : 401.23
Waves 5: 502.15 |6.0: 603.08 |7: 704.00 |8.0: 804.92 |9: 905.85 |10:1006.77

Note: 31 Meters is probably the best SWL band on the entire dial. Always popular with many nations, and usually well packed by signals any night of the year. It is just on the low side of WWV at 10 Mhz from the 30 meter WARC Amateur Band.


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06/99