we have a fixed aerial on the roof of our van with a booster box in the cupboard, I can pick up all 5 channels even when the van is parked up very close to my house with the house supposedly in the way of the signal.
As for the uglyness issue, if they start checking on that I'll never be allowed on any site.
Seriously though please live and let live, the aerial will only be a major issue if you make it one by becoming fixated with it.