The vertical antenna shown is a ¼-wave vertical radiator suspended from a tree with only two sloping radials instead of the conventional three or four. This is a practical field-expedient configuration often used by portable and emergency operators where space or support is limited.
Unlike a classic ground-plane that relies on multiple radials to form a symmetric RF ground, this design uses two opposing radials to provide the necessary return current path and impedance transformation. A vertical quarter-wave radiator forms one half of a dipole. The missing half is replaced by a current image in the radial system.
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