^^^ Unlocator is a VPN service which allows users to route their internet traffic via servers in specific countries. (So that you can choose a server in the USA to access US TV services, in France to access French services and so on). There are many other similar services.
Some VPNs (particularly the free ones) don't allow you to select which country your traffic is routed through. They simply hide your IP address but give you no choice about what replaces it. So you need to check what it is that you're signing up for.
Free VPNs have a nasty habit of slowing computers to a crawl or bombarding you with adverts. (In particular, I suggest avoiding Hotspot Shield. Installing the free version left my netbook virtually unusable and paying to get the full service didn't get rid of the problems).
The most popular VPN among ABers seems to be TunnelBear. However you only get 500Mb of free traffic per month (which isn't much at all). Thereafter you have to pay.
https://www.tunnelbear.com/
Windscribe offers more free data each month (but still not enough to stream lots of overseas telly).
https://windscribe.com/
If you
only want to hide your IP address (and don't care which part of the world your internet traffic is bounced around), simply use the Tor web browser (with Javascript disabled) to completely anonymise your internet activity. If you want to watch a single TV programme from the USA, consider using one of the free VPNs (but remember that if they slow your traffic too much you won't get reliable streaming). If you want to stream a lot of content from 'geolocked' servers abroad, you'll need to pay for a VPN.
(If you're prepared to fiddle around it's sometimes possible to configure your browser to route your traffic via an anonymous proxy server in another country, using this list to find one:
http://www.nntime.com/ and following instructions such as the ones for Firefox here:
http://www.wikihow.com/Enter-Proxy-Settings-in-Firefox . I've done it myself plenty of times but finding a proxy server from that list which actually works, and with a speed fast enough for streaming, can take lots of trial and error).