Antenna choice

Just curious if anyone has tried different cheaper antennas. I don’t need rtk accuracy for this job and was wondering if there’s a single antenna system that will keep me within about 30 cm’s. I’ve been using the ardusimple rtk2b system and it’s awesome but I’m trying to set up another machine much cheaper is possible. Thank you.

Lots of good info on an alternative to the F9P. Dual GPS for less than a Single F9P and the UM982 is triple-band vs F9P dual band.