Bollocks they're cheapy ten elements. The cheapest and nastiest lowest gain aerials there are.
all vertically
It's probably because the local tx was Gp A the Channel Five started on
67 or 68.To reiterate my earlier comments:
The thing at the top could be a glass fibre colinear* for anything VHF or UHF, including RSL VHF FM radio. Or it could be an old Aerialite AM aerial (they had a coax feeder). Or anything really!
The mast and chimney brackets are very old. The corner plates have almost rusted away. It looks as if an old mast and bracket pair has been re-purposed, and lowered.
The two contract-quality UHF TV aerials are of different historic channel groups; a Gp A and a Gp CD. The two TV aerial on the opposite corner are the same, except that the top one has been replaced because the boom on the top one snapped due to the U bolt hole being oversized.
If this is a shared chimney, the other corner belonging to the same house as the tall aerial has what looks like a vertical dipole for something or other, could be VHF FM but it looks a bit too long. There's another aerial of some sort on the same fixing. These are much newer than the tall mast (look at the corner plate nearest the camera).
*colinear: several dipoles in a stack, inside a shroud of some sort. Gives a bit more gain than a single halfwave dipole.Bill