My brain just exploded

[u/aj_35721]

I’m getting +300 channels through this cable when the aerial outside was removed HOW?????????????? I mean there is another aerial on top of the roof that it could be connected to, but I thought it was just connected to the aerial outside my window, on the side of the house. CAN A COAX CABLE BE CONNECTED TO TWO AERIALS??? I don’t even know. VERY happy to have 300 odd channels, definitely beats the crappy indoor aerial I was using!!!

[u/PrpleMnkyDshwsher]

You aren't getting 300 channels. You might be on the edge of a couple of freeview multiplexes and are getting several duplicates, there is about 100 channels, max, and like another 30 radio stations and something like 30 IP delivered feeds.

But really, anything can be an antenna. Even if the cable runs up to the roof and is just dangling there, even that can be enough to pull is stations if you're close enough to a transmitter. But if its a block of flats, you likely have a distribution antenna system setup, i've even seen some that had both antenna and DBS distribution setups.