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What service are you paying for, that gives you television channels currently?
Or are you NOT paying for any service?
You can get access to A whole bunch of online content for some networks ( channels), but they require that you have a subscription to a Cable or Satellite provider.
Many Networks (channels) now have streaming LIVE the same content you would get on a subscription providor channel.
Not all networks(channels) are like this....some only offer on demand content of some of their shows, while others offer everythign.
If you are trying to get more channels through your current providor....i need to know what your current providor is first.