DURATRAX Frequency Checker External Antenna DTXP3111 --Duratrax 75MHz Frequency Checker External Antenna DTXP3111 This is the 75MHz Frequency Checker Antenna for the DuraTrax Frequency Checker, DTXP3110. FEATURES: Increases the operational range of the Frequency Checker to 1000ft (305m) maximum INCLUDES: One DuraTrax 75MHz Frequency Checker Antenna REQUIRES: PLugging into Frequency Checker SPECS: Fully Extended Length: 6.6" (168mm)