Which box do you have?
Have you tried a retune?
What happens if you plug the aerial directly into the TV bypassing the box?
Do you get all channels or are a number of channels missing?
If the latter this would suggest an issue with your aerial and you will need to contact a local installer to rectify.
From the 29th of March our TalkTalk Community will move to peer-to-peer support and the TalkTalk team will no longer be here to support with queries. Don’t worry we still have plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link here:
How to contact TalkTalk Broadband - Help & Support.
