[Technologist]

I know news injects better than sports. There they were once coax, then went to fibre. The BBC once had a few injects connected by dark fibre PAL connections normally used for CCTV

IP has changed how inject points are fitted out, .....

The BT Redcare RS1000 analogue video circuit - usaully as the RS1000D with a 100M IP connection
was useful and not too pricey ...... It had a number of disadvantages ....
it was on dark fibre and could not go far without repeating
which was a receiver amd transmitter in an exchange somewhere
(and often unknown to staff)
The fibre interconnect in the exchanges were not "normal" and occasionally got disconncted
The videos qulaity was OK (just)..... sound more marginal ( but OK for news!!!!)

The major shortcoming for broadcasters was that it was on a 4 week fix
with a sort of best endevours in the mean time....
But was cheap companed to a Tariff V circuit
and it also could give you a Local 100M connction to places
that Openreach seemed very relunctant to sell a proper IP coax to!!!

These days a good (FTTP) connection is more than enough!
and most people have them! = and SRT to the Major Broadcasters or BT Tower,
or use Bonded Mobile 4G/5G ...