Effects of tower and guys on performance of side-mounted vertical antennas

The omni-directional pattern of a vertical antenna when side-mounted on a mast or tower, is distorted as a function of tower diameter and separation in wavelength. The pattern is further effected by obstruction of metallic tower guys. Laboratory and field measurements of these effects are analyzed. Possibility of taking advantage of these effects for special coverage is suggested. Tower effect on antenna impedance is briefly discussed.