I live in canada (Maritimes) there are lots of hills and turns in the roads down here. I have the whistler pro 73. I am getting about .2or.3 miles in average on the real sharp corners I have to be just coming around the turn to get the alert but he could be a mile away. I fine this radar is not real good on the sharp corners, or if you are coming up on a cop from behind and he is shooting radar ahead of me. But over all it does work well I think. If the terrian is flat it works very good on all bands k and ka band seem to be equal in range to me. Is there any radar that would be good in these types of condions or do they all not perform well in these areas.