Find the TV transmitter?

[ppppenguin]

I suppose this is the starting point: https://www.freeview.co.uk/help/what-tra...ive-signal It can use current location as well as postcode.

Or use Freesat.

  Unfortunately its not much help when you are miles from civilisation and you have no idea which way to point the aerial.  The canals have no post codes either!

Satellite TV is not easy on a narrow boat that rolls a bit when you move  either!  I've watched the performance of others trying to get their dishes on the roof in the right azimuth when the boat rocks every time they stand on the gunwale.

I said it could use current location. So presumably taken from the GPS on your phone if that's what you're using. Whether it works well is another matter. What you need from it is the bearing ot the TX. A cheap signal strength meter should help youto swing the aerial, even if you don't know the correct bearing.