Having more ports than you need will incur some extra loss, since the
signal power has to be divvied up (usually equally) between them all. On
the other hand, there's a pretty good chance that you'll want another
port or more in the future - especially in time-nuts type pursuits, so
it's good to have a spare. Too many is nearly always better than too few.
Be sure to get a type that will pass DC through at least one port to
common, assuming one of the GPS Rx units will be supplying antenna
operating power. Likewise, you'll want to watch out that there are no
power conflicts with multiple units trying to juice the antenna circuit.
Sometimes you may need to have DC-blocking too, or redundant
power-OR-ing, depending on the equipment and setup.
Ed
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