A Kenwood AT-230 Antenna Tuner. Rear panel jacks: Input is SO-239 (UHF). Antenna Output 1 is SO-239 (UHF), Antenna Output 2 is SO-239 (UHF), Antenna Output 3 is wire connection and ground. It covers the 9 amateur bands from 1.8 to 30 MHz.
eBay