It seems that the famous SteppIr antennas have competition. The principle of both SteppIr and Ultrabeam is the same - the length of the element can be changed by the controller. The element consists of a beryllium-copper strip that is inserted or extended from the magazine using a stepper motor. The amount of protrusion determines the resonant frequency. It is thus possible to precisely tune the antenna to the required frequency. Ultrabeam offers another type
yagi antennas, it is a European producer, but the price is still quite high for our people.
Ultrabeam.it website 
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