I have an in-dash DVD/TV Tuner (analog) in my car. The TV system is PAL/NTSC. I understand I will need to purchase a digital receiver box. I started to purchase one from Enon (E770 DVBT) but found out that their box does not work in the USA. Is there anywhere I can purchase a digital converter for my in-dash mobile TV tuner and will I also need to replace the antenna? Thanks.