Basically this is a typical drawing of connections between transceiver and antenna in case of use the LNA (Low Noise Amplifier).
The first one is the 144 MHz set-up. Use the transceiver and LNA without power amplifier.

We used:
-one coax cable
-2 coax relays
-an antenna
-a LNA
-a transceiver
On this picture you can see the 144 MHz set-up with power amplifier. This one is good for EME and MS operation.

We used:
-two coax cables
-2 coax relays
-an antenna
-a LNA
-a transceiver

You also can use this set-up for 432 MHz band. For 23 cm band I recommend use this set-up.

73,
Alex K6VHF