Which status type aerial do you have Olive?
The flying saucer shaped one, or the flat triangular shaped one.
From experience of both, I can say that the triangular shaped one which you can rotate from inside the caravan and alter from horizontal to vertical, gives much better performance, although still not as good as a proper external TV aerial mounted on a pole.
An alternative approach is to go down the satellite route, which we also use if we struggle to get a decent signal through terrestrial broadcast. This means carrying round extra kit and it takes a bit of practice to set up quickly. But it works well so long as you can get the dish to point around 28 deg east of south without being blocked by adjacent caravans, awnings or hedges, etc. We bought a "B" grade suitcase type satellite kit from Maplin for around