I saw this listing on ebay today. Don't know if it is a better price or nothttps://www.ebay.com/itm/RTK-Antenna-Base-NMO-Magnetic-Mount-Trimble-GPS-Ag/132714412681?hash=item1ee6653a89%3Ag%3AfwsAAOSw8zNa81eK&_sacat=159685&_nkw=trimble+rtk&_from=R40&rt=nc&_trksid=p2499334.m570.l1313.TR5.TRC2.A0.H0.Xtrimble+rtk.TRS0.TSS0