aeriel advise please?

Morning all!

We are currently on site. We recently bought an Avtex tv bundle. We decided not to get a satellite one, as not that bothered about getting hundreds of channels while away. Where we are at the moment, we can't pick up any signal. Wondered if we could just buy another aeriel that would do the trick. The one we have, just sticks on with a suction pad. Don't really want to start putting holes in the caravan roof to fit an aerial.