According to the coverage result you have, it may be that your aerial will need to be repositioned to receive the best channel line up. To assess the situation for your address, you will need to speak to an aerial installer.
We suggest you get in touch with the following organisations who can give you details of one or more members who operate in your area and guarantee their work:
A local installer will understand the circumstances and local geography in your area and suggest the best option available to you.