Monday, February 14, 2011



This is the antenna I have found to be the most effective limited space radiator that I have ever used.

The main requirement is to get it positioned in the clear, away from buildings if possible. Having said that, it is possible to hang a groundplane from the limb of a tree, this also works very well. The diagram below shows the basic design:

The Formula for calculating the length of the Radiator is given by:

L in feet) = 234/(Frequency in Mhz)

There is a school of thought which holds the view that the RADIALS should be 5% longer than the Radiator, but I have found, together with others, that the Radials should be the same length as the Radiator.

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