A 5/8λ (five-eighths wavelength) antenna is very popular on GMRS (462–467 MHz) because it offers more gain than a 1/4λ or 1/2λ whip, especially when mounted high and in the clear. In the UHF band (GMRS is ~462 MHz), a 5/8λ vertical is roughly 15.5–16 inches long physically (not counting any loading coil at the base that some commercial designs use). Radiation Pattern Characteristics (Free-Space, Ideal 5/8λ over Perfect Ground Plane) Maximum gain : ≈ +3 to +3.5 dBi in free spa