What/How is NBA TVA

   I live in Florida and in a rural area where Comcast rules but has obsolete equipment, meaning that they do not offer NBA ?Ticket?. For technical reasons , satellite tv in my home is not appropriate. Therefore I have to watch the nationally televised C's games or nada. I see some are occasionally on "NBA.COM". Does this mean they are available to all peeps with a computer and Inet? Or is some sort of signup required. I am currently logged on to NBA.Com, but of course, as in all things from the NBA HQ, there is no such Icon stating something like "this is how you get NBA.Com

   Any help would be appreciated. I'm sure I'm not the only one who would like assistance here.