In the database, the frequency listed as "frequency" is the high-power side of a system. For a repeater system, it's the repeater's output, which is all you need to monitor because the repeater repeats the input frequency's traffic at a high power. In a half-duplex system(commonly used with MED channels), it is the base station transmit frequency.
The input, on the other hand, is the frequency that portables and mobiles transmit to the base station on. You only need to monitor this if you are listening to a system that doesn't employ repeaters.
It should also be noted that Adams County sometimes uses Med-1 for EMS-to-hospital communications, especially in the Hanover area, where co-channel interference with York County on Med-5 might be an issue.