On the two terminals on the left... they are labeled 300 ohms. This is for twin lead, regular old fashioned twinlead TV antenna wire.
The 2nd and 3rd terminals from the left are labeled 75 ohm and Ground. This is for coax. The middle lead of the coax goes to the 2nd terminal from the left, and the coax shield goes to the 3rd terminal, which is chassis ground.
AM loop antennas, and that type is the only practical type for AM reception, connect to ground the AM, which is the terminal on the far right of that antenna terminal group.
Your exact connections may be positioned differently, but marked the same.
Some receivers have F-connectors, threadded connectors like on cable TV, which is 75 ohm.
If your receiver does not have connections for 75 ohm, but you have cable coming in from the antenna, then connect a balun aka transformer to the end of the cable. This is a small cylindrical device with the threaded F-connector on one end, and two 300 ohm leads on the other, usually with spade lugs. Connect the spade lugs to the 300 ohm terminals on your receiver or tuner, and screw your incoming cable to the other end of the transformer.