Yaesu ATBK-100 Antenna Base Unit

ATBK-100  ANTENNA BASE UNIT ATBK-100 VHF-UHF antenna base/counterpoise kit for ATAS-120A The ATBK-100 fits over a user-supplied antenna mount on the metal handrail of a flat, apartment or townhouse balcony, and it includes counterpoise radials for the 50, 144 and 430MHz Bands, with the Bands, with the balcony railing providing the counterpoise for the HF band.   Component list:       Counterpoise radials - 4       Radial mounting ring       Spanner wrench       Hex (allen key) wrench   Specifications50MHz Element 1 & 2 (approx)           Stud, 1cm                                                         Coil,  8.7cm                                                         Whip,  60cm 144MHz Element, (approx)                 60cm 430MHz Element,  (approx)                18cm Mounting Ring  (outer diam, approx)   5.4cm Mounting Ring  (inner diam, approx)   3.6cm