TV Ariel problem, how can I fix it ?

Hi,

My parents recieved a weak signal from their ariel, a engineer fitted a little white box which was plugged in to strengthen the signal, this was working fine until it had to be disconnected during a move of the furniture, my dad then reconnected it but put the wires into the wrong bits, i.e the connection went in to the out and the out into the in..this has since been fixed but still didnt work and since then the TV has absolutely no signal even with a connector attached to the ariel and plugged straight into the back of the TV. Has it blown something and is there anyway to fix it ?

Gail
January 2009