The BBC don't have international broadcasting rights for football commentaries (except as below). That means that they're obliged to ensure that their commentaries aren't available overseas. (Even if you had internet access, you wouldn't be able to hear the commentary on Radio 5. The BBC's server detects that a connection is made through an overseas ISP and blocks the commentary. That also applies if you try to connect to a football commentary, on a BBC local radio station, from overseas).
BBC World Service has the rights to broadcast commentary on just one Premiership match, each Saturday afternoon. So you can hear this, either on shortwave or via the internet, but nothing else.
Details of how to hear BBC World Service can be found here:
http://www.bbc.co.uk/cgi-bin/worldservice/psim s/ScheduleSDT.cgi
It's extremely unlikely that you'll be able to access any radio commentary for the Liverpool v Chelsea match. US broadcasters will be unwilling to pay a massive licensing fee, only to reach a relatively small audience. US TV cable and satellite broadcasters might show the match but, as Mushroom25 indicates, it's likely to be on a pay-per-view basis.
Chris