That statement doesn't agree with my quick modeling
just read a few articles about DHDL antennas. One article states, the cut off frequency where the antenna becomes useless is when the overall length of wire reaches a 1/4WL...
my results attached 73, Martin, OK1RR
CM Double Half-Delta Loop RX Antenna CM By George Wallner, AA7JV CM used at Chesterfield DXpedition TX3A CM optimized by OK1RR CE SY h=1.5 SY vh=3.700271 SY l=17.79364 SY R=1126.759 GW 1 10 0 0 h 0 0 h+vh 5.e-4 GW 2 10 0 0 h+vh l 0.1 h 5.e-4 GW 3 10 l 0.1 h 2*l 0 h 5.e-4 GW 4 10 0 0 h l 0 h 5.e-4 GW 5 10 l 0 h 2*l 0 h+vh 5.e-4 GW 6 10 2*l 0 h+vh 2*l 0 h 5.e-4 GE -1 LD 5 1 0 0 58000000 LD 5 2 0 0 58000000 LD 5 3 0 0 58000000 LD 5 4 0 0 58000000 LD 5 5 0 0 58000000 LD 5 6 0 0 58000000 LD 4 6 10 10 R 0 GN 2 0 0 0 13 0.005 EK EX 6 1 1 0 1 0 0 FR 0 0 0 0 1.82 0 EN
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