Recently tried to have HDTV installed in my home. The cable guy said our coaxial cables in the house are too old and produce too weak a signal for the upgrade. I believe they are RG-59. We have decided to have all of the coaxial cables in the house replaced due to this issue. What is the best cable grade and type to buy for this application. I will be using the coaxial cables for my router and televisions(6) only. Also our home is pretty large and if it is possible I want a cable that will be technologically appropriate/relevant for at least 30+ years.