This is the antenna that I am now using. I do have it mounted over an 18" pizza pan... I don't know if that does any good, it seemed to work fine without it. https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649