You'll need to post more information than that if you want suggestions from the community forum.
And you might also want to contact 48 support for assistance.
Hope this helps.
What is your area?
How exactly is the signal bad?
How are your measuring this and what are the symptoms?
Was it always bad or did you just start having problems recently?
How long are you with 48?
What make and model of phone?
Do you know other 48 users in your area and do they have the same problem?
And so on...