I have two GPS setups, and looking at the Uniden for the SDS100, it looks like the integrated antenna/receiver just sends the NMEA data
over the cable. You don't need the pricy uniden for the same thing.
If your 'puck' is just an amplified antenna, there are cheap GPS receivers that output RS232 NMEA data, perhaps as little as $30.
If your puck has like a 5 wire cable, it is the integrated type. and all that is needed is power, ground, and serial data you can pipe
into aplications or radios that process the data.
One of mine is the Trimble integrated I use mainly for timing/time, the other is just the antenna feeding a GPSDO receiver.
That was like $42, and outputs serial data for software applications and a 10 MHz reference for a lot of my equipment accuracy.
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