A communal aerial system (MATV System), normally comprises of one aerial feeding several dwellings via a network of cabling. If your MATV System is unable to deliver the digital signals to your dwelling then it possibly means that the aerial system needs upgrading. You will need to contact the person responsible for the maintenance of the aerial system; that could be your Local Authority, your Housing Association or your Private Landlord. You cannot upgrade just one point; the whole system will need to be upgraded.