99.99% of remotes are IR.
There are a number of options for ir repeaters and extenders ranging from cheap (Pyramid and Radio Shack) to far more capable RF remotes with base stations that blast ir.
If you want to keep the Yamaha remote and just use a repeater, search for Pyramid, Niles, Xantech, etc products. Crutchfield is a good place to start to see the types that are available. IMO, an RF capable remote and base station like the MX series from Home Theater Master is a far better choice if you will have all of your components behind closed doors.