 Pseudo-Franklins have been employed below 1400 kHz, however, to good effect, but no where near as good as a true Franklin.A true Franklin (180 over 180 degrees; 360 degrees, total) has an efficiency of about 510 mV/m/kW at 1 km.A pseudo-Franklin (180 over 120 degrees; 300 degrees, total) has an efficiency of about 470 mV/m/kW at 1 km.