You have one one of these:
http://www.winegard.com/mobile/crank.phpYou can find the manual there as well to help you get setup. If it's more than a few years old it may flop around in the wind but it will work pretty well at other times. Some use a bungee cord to hold them in place in the wind. You can also replace the base if this is an issue and it will make it much tighter but will still move a bit.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?