Unfortunatly this is not a requirement yet but the good news is that all aircraft in controlled airspace must be equipped with ads-b out by 2020.
I believe the requirement now are: USA (FAA) All commercial turbine-powered transport aircraft with more than 30 passenger seats (or MTOW above 33,000 lb or 15,000 kg) TCAS II 1 January 1993 http://en.wikipedia.org/wiki/Traffic_collision_avoidance_system
When do I have to equip?
The rule requires ADS-B Out performance by January 1, 2020, to operate in designated airspace. If you never fly into ADS-B-designated airspace, then there is no requirement to equip.
The ADS-B ground infrastructure is being deployed now and will be fully deployed by 2014, so those who choose to equip early will realize benefits long before the mandate.