Unterminated RF Combiner Input Port
Combiners that have isolation between ports (so hybrids, wilkinsons etc) also have at least 3dB loss per transit. The interport isolation means that you do not have to worry about terminating all ports, the 'in-use' ports will be isolated from the reflecting ports. However, the loss of a cascade of these things will mount up. They also require a fairly large bit of board real estate for printed couplers.

Try looking at RF switches, for instance Perigrine (I don't have shares in them, but used them a lot when designing RF stuff). Large portfolio of very tiny very good RF switches.