This is a Replacement Antenna for All FG Series Futaba Radios such as (but not limited to) the following radios. 4 CH: 4FG 5 CH: 5FGK 6 CH: 6FG, 6FGK 7 CH: 7FGK, 7FGHI, 7FGE Female threaded section inside antenna base INCLUDES: One Transmitter Antenna NMH 9-22-92 ir/jl updt jxs 2/20/06