If you need a new aerial installation, a typical aerial replacement based on industry guidance, costs £150.
Additional sockets (for other TV sets you own) cost around £45 each.
When it comes to aerial installations and modifications we recommend you always use a qualified aerial professional.
Get in touch with either the Confederation of Aerial Industries (CAI) or Get Me Digital who can give you details of one or more members who operate in your area and guarantee their work:
Find an approved CAI installer at Get Me Viewing
Find a digital professional at getmedigital.com
A local installer will understand the circumstances and local geography of your area and suggest the best option for you.