Share GPS signal with payload

I have a UAV payload that requires an L1 3.3V active gps signal. I also would like to utilize RTK positioning. I am kind of new to this, but it looks like using the Tiny RTK with a GPS antenna splitter prior to the SMA connector will work. Thoughts? I lose the integrated compass that the XL RTK has. Any recommendations for compass that can be used along with the Tiny RTK external to the PixHawk 2.1 Cube? Also, recommendations for the antenna to connect to the Tint RTK? Thanks.

Never mind the antenna question, I see antennas on the product page.