Yeah the software is ... interesting. I'm actually less than a mile away from a reference station, but don't get 1cm accuracy because I don't have a much of a sky view from my apartment's window. (But I'm moving soon and have a great sky view. And am closer to the reference station!)

Another thing you might find interesting is that you can generate a report on how good your reference station is. It's actually in Sparkfun's documentation, so you're probably aware, but if not: https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss... Specifically the part where you collect data with u-center and upload the results to https://webapp.csrs-scrs.nrcan-rncan.gc.ca/geod/tools-outils... for analysis was very interesting.