I don't think you will find a course on aerial installation as its just a case of fixing the aerial and pointing it in the right direction.
The only way I can think of is to work for a local aerial company or apply to sky for a job.
When I worked for Sky it was about 3 days training, 2 weeks with a with some one already installing sky, after that you were on your own. All they worried about was how many jobs you could install in a day. You will find with Sky you will have to comply with a lot of H&S requirements i.e. wearing a hard hat using a harness and rope to fasten yourself the ladders etc. I don't know about the H&S of aerial installers. But remember a lot of aerial installations require you to go on the roof so if you are afraid of heights don't bother.