Virgin only use fiber to the cabinet. They use coax to the house, but it should look different as it will be terminated with F-connectors, not aerial connectors.
Signal boosters only work if you have a weak signal. If you have a bad signal they will also boost the interference of the signal, leaving you no better off.
Check your aerial. Make sure it hasn't blown over and is half hanging down the roof. If you have a broken coax from the aerial, a booster will also not help, as you will need to replace the cable. Check the coax, especially if it runs up the side of the house or has been rubbing loose against roof tiles. Look to see if there is anything tall between the aerial and the TV transmitter, such as a large tree or building.
It sounds to me like the problem is in the aerial (positioning) or the cabling to the aerial. If you want to fix a weak signal, this is what you need to get fixed before looking at anything else.