Hi @fobter, good question.
You use a diplexer. It splits the path and has a filter for each frequency. It is also setup so that each port is at 50 ohms impedance for the given frequencies. A T splitter won’t do that and won’t be as good.
Here is one I built some time ago.
You can see they are quite simple but you need suitable test equipment to align them or to optimize the parts if surface mount components are used.
You can of course buy them online and they are cheap for low power, which is all you need for receive. You might see them incorrectly called a duplexer. Arrow antenna does that as I remember.
G0KLA / AC2CZ