2007, the Commission approved a regulation that requires cable systems to carry the analog signals if the cable system uses both types of transmission. The FCC left the decision to also retransmit the digital signal up to the cable provider. Digital-only operators are not required to provide an analog signal for their customers (AT&T U-verse, Verizon FiOS). Small cable operators were allowed to request a waiver. The regulation ended three years after the date of the digital television transition (which occurred on June 12, 2009), and applies only to stations not opting for retransmission consent. Cable operators (analog and digital) that transmit more than 12 channels need only provide a maximum of their total channel size to this must-carry requirement. Thus with about 150 channels available to a 1 GHz operator, they are only required to support up to 50 analog channels (42 for 850 MHz, 36 for 750 MHz). Cable providers that decide to scale back their analog selection merely need provide written notification on their bill (or equivalent) for 30 days prior to their change. Customers already using digital cable set-top boxes will usually be unaffected (if anything after the change, they may get a large number of additional channels because each analog channel can be replaced by 2–51 digital channels). The requirement only applies to must-carry stations; most metro providers carry many more analog stations by choice, not law. Other networks A variation of "must-carry" also applies to DBS services like DirecTV and Dish Network, as first mandated by the Satellite Home Viewer Act. These providers are not required to carry local stations in every metropolitan area in which they provide service, but must carry all of an area's local stations if they carry any at all. Sometimes, these will be placed on spot beams: narrowly directed satellite signals targeted to an area of no more than a few hundred miles diameter, in order to allow the transponder frequencies to be re-used in other markets. In some cases, stations of lower perceived importance are placed on "side satellites" which require a second antenna. This practice has raised some controversy within the industry, leading to the requirement that the satellite provider offer to install any extra dish antenna hardware for free and place a notice to this effect in place of any missing channels. Retransmission consent If a broadcaster elects retransmission consent, there is no obligation for the