Well.. I don't have any experience with the SMC access point you're using, but just today I set up the same basic layout with 2 Linksys WAP11s. I've got one (set as an Access Point) connected to my PC through a linksys router and the other (set as an Access Point Client) connected to the rio receiver (using a cross-over cable). Seems to work fine for me! I was pretty surprised at how easy it was since this is my first stumbling foray into wireless...

I've seen mention on some wireless discussion boards that some of the SMC wireless devices have the same basic hardware (even to the point that they run the same firmware!) as the Linksys devices, so it may be as simple as setting your SMC to act as a client and connecting it to the Rio with a crossover cable...

Hope this is some help...