Radiowaves 2-ft. (0.6m), 1.35 - 1.535 GHz, with fine adjustments - SP2-1.3NS..
Radiowaves 3-ft. (0.9m), 1.35 - 1.535 GHz - SP3-1.3..
Radiowaves 4-ft. (1.2m), 1.35 - 1.535 GHz - SP4-1.3..
Radiowaves 6-ft. (1.8m), 1.35 - 1.535 GHz - SP6-1.3..
Radiowaves 8-ft. (2.4m), 1.3-1.535 GHz - SP8-1.3..