I've always noticed our population is correct & it counts acres correctly but the spacing is erratic. The neighbors field looks so nice & even & can almost check it from the side. While planting the last field it dawns on me the radar speed varies from 5.3 -5.8 mph & the hydraulic drive must be trying to match the speed, it varies from 138000 - 142000 plants per acre. I've checked the radar mounting & has the correct angle. Are there better radars for accuracy than the one that came with the planter which is a small 4"x4" rubber mounted one? Our last ground driven planter placed the seed perfectly & could check it from the side.