The mast is a length of 1½" alloy aerial tube, nowhere near strong enough for the wind load. But before the mast snaps, the top bracket will probably pull the brickwork down. The bracket is fixed to one brick at the apex of the wall, always a weak point. Note also the shoddy cable fixing and the use of insulating tape to waterproof the connector.
The ‘halo’ is a VHF FM aerial, and in my opinion it is an abomination. The idea is that it is omni-directional (it receives from all directions), and that it is horizontally polarised. It’s a folded dipole, bent into a near circle, and as such it’s a severe design compromise, like a brick is a serious design compromise if you set out to build a helicopter. It’s the only aerial I know of that has a negative gain figure – in other words it’s got less gain than a dipole. Actually, I think it’s got less gain than an isotropic source. Is that possible? It sounds like perpetual motion in reverse. Anyway, the halo is pointless because all VHF FM transmissions are either mixed or vertical polarity, so a vertical halfwave dipole works better and is considerably more elegant.
Just to square the circle of absurdity, this particular halo has been mounted for vertical polarity! Since the response of a halo looks (in theory) like a doughnut, presumably this one will be a doughnut on its side.
This series of photographs shows a dreadful piece of work on the roof of a block of flats. The installation is inherently unsafe, but someone has made an attempt to strengthen it by the use of 'guy wires'.
This shot shows the full height of the installation. The aerial is a large high gain type - quite heavy and likely to catch the wind.