I have an F&L 10 Collar box tracking 217.000 through 217.099 on a 3 Element Antenna & 5 Tracking Collars (1 Quick Track & 4 Johnson 8k hour). The 4 Johnson collars all just had fresh batteries installed by Johnsons Telemetry the week of the Jr. Nationals in June of 2013! All collars are all in good shape & beep strong- box tracks well & has a good straight antenna. I am just wanting to switch to a gps unit- PRICE $400 - Call or text for pics or more information 501-802-0958. Thanks...!