I want to use NS-RAW to map existing infrastructure (for example burried cables) and to locate them in future, i need somethink like +/- 10cm accuracy for this. I have one NS-RAW with some small antennas (internal antenna from NAVSPARK and some magnetic one). I'm using public basestation via NTRP protocol (running RTKLIB on laptop) but it's very hard (almost impossible, tried a lot of settings to get FIX. I think i need bigger antenna for my rover. Can you recommend some relatively cheap one for this needs?