If I have to move from one place to another, approximately 50 feet east to west, with an antenae on a trailer, how do I set the antenae to the new position? (WiFi Tower reception)?

I have an antenna for my Computer, which is a WiFi link to the tower. It is pointed ant an angle South Southwest from where I am. I will need to move to another mobile trailer, and I want to avoid paying expenses for getting the work done. How can I take the antenna from the one trailer, and mount it either on the other, or on a pole and get the proper alignment?