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					Originally Posted by updater  Am I right in thinking that putting a wireless router in between the PC and the cable modem is All I need to do? | 
	
 I can't say anything about set top boxes, but the setup I have is:
Coax from wall > Modem > Rj45 > Wireless router > RJ45 > 4 computers
And the wireless works fine when I enable it.  Unless your STB interferes somehow (?) it should work just fine.  The only issues I had were to do with the router settings, not the actual setup.
Hope that helps.