Loft Mounted Fan Dipole, Coil Loaded For 40 Metres 

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RES in Loft 

Res at TX 

B'WIDTH 

B'WIDTH 

B'WIDTH 

B'WIDTH 

Mhz 

Mhz 

SWR 

SWR=1.5:1 

SWR=2.0:1 

SWR=2.5:1 

SWR=3.0:1 

 40 Metres

7.103 

7.150 

2.1:1 

-- 

-- 

7.096 – 7.208 

7.058 – 7.241 

20 Metres 

14.240 

14.300 

1:1 

14.026 – 14.630 

13.790 -- 14.850  

-- 

-- 

17 Metres 

18.118 

18.090 

1.2:1 

17.900 – 18.470 

-- 

-- 

-- 

15 Metres 

21.220 

21.188 

1.5:1 

-- 

21.030 – 21.380 

20.930 – 21.530 

-- 

10 Metres 

28.380 

28.440 

1.4:1 

28.370 – 28.490 

28.250 – 28.630 

28.160 – 28.760 

28.000 – 29.930 

BANDWIDTH USING ICOM 703 BUILT IN ATU 

Mhz 

40 Metres 

7.040 

7.180 

SWR=1:1 

20 Metres 

14.100 

14.340 

SWR=1:1 

17 Metres 

18.110 

18.160 

SWR=1.:1 

 15 Metres

21.150 

21.400 

SWR=1:1 

10 Metres 

28.100 

28.800 

SWR=1.3 – 1.1:1 

29.000 

29.650 

SWR=1.4 – 1.1:1 

Measurements made using MFJ-259 SWR Analyzer. In loft using 1.5 coax lead from balun to MFJ-259 

Coax feed to TX approximately 10m, almost vertical drop of about 3.5 metres.