ANTENTOP- 01- 2014 # 018

44 Feet Dipole. Where is the Truth?

Note I.G.: Below you can see SWR (at 350- Ohm Terminal) for 88- Feet Dipole Antenna placed at 10 and 20- meters above real (simulated by MMANA) ground. As you can see the 88- feet antenna really has at the amateur bands SWR/Impedance that could be matched with simple ATU.

As you can see, the 88- Feet Dipole Antenna is much better matched with 350- Ohm feed line in compare to 44-Feet Dipole Antenna. It is only proved the old amateur's wisdom on antenna- the bigger the better.

On my look the 88-Feet Antenna is more preferable, but room for this one!

SWR (at 360-Ohm Terminal) of a 88-Feet Antenna Placed at 10- meters above Real Ground

SWR (at 360-Ohm Terminal) of a 88-Feet Antenna Placed at 10- meters above Real Ground

Now , using the standard accepted formula for calculating the ¨approximate length of a wire dipole for the HF frequency range from about 5 to 25 megaHertz... 143 / frequency in megahertz let us play with a little math amigo !!!

143/ 7.15  for the half wave resonance on the 40 meters band will yield exactly 20 meters , so 10 meters on each side or moving to Imperial British Measures 65.6 feet overall or 32.8 feet on each leg. (Figure 3 shows the 66- Feet Dipole Antenna.)

Figure 3

66- Feet Dipole Antenna

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