Your problem has many fixes depending on how you use your radio, but first think of were you are transmitting from a van or car is literally a big metal box so the squelch minimum will increase a bit if your antenna is inside the van. but if you use/get the UHF-DC adapter for this radio it will alow you to mount a exturnal antenna on the outside of the van, the other possibility is a bad placement of the antenna try changing its location. however if the noise increases as you excelarate then you might need a in line DC Noise Filter.