Topband: DHDL

[Martin Kratoska]

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
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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