Via radio: Just Greene, Montgomery, and Miami counties.

Via tunnels:
Ohio:
Athens N8XYM
Clinton W8GO
Franklin N1CTF
Greene many
Pike N8WQ <--- Correction
Miami KF8I, AE8I
Montgomery many
Warren N8VSI

Other states:
AR N5JHR
FL WT0F
PA AA3JC, N3FUD
IL KV3T
IN K9KDJ, AC9XU
NC N2MH
NJ N2MH
OH W8GO
OK KI5VMF
TN AK4ZX
TX N5MXI
VA KN9U

Other continents:
Asia:
Indonesia YD0BCX