Hi Jack,
Is your antenna signal booster on? There is a gadget one can buy to enhance the DTV reception. Go to
http://www.rvupgradestore.com/index....OD&ProdID=3000 and read about the addition to the antenna. It is an easy install.
Lastly, one must let the converter do an auto tune at every new stop. This is a PITA but its the only away to make changing channels bearable. As soon as you raise the antenna, let the converter complete an auto tune.
Since installing my DTV converters, I haven't rotated the antenna. I just crank it up and it seems to receive what ever local channels are available.