 As the U.S. dollar has been declining as of 2005 versus other international currencies, the decline in DirecTV viewership in Canada may well be related not to a cost difference as much as to the series of smart card swaps which have rendered the first three generations of DirecTV access cards (F, H and HU) all obsolete.In some areas, an additional option is a form of over-the-air broadcasting, either via a multichannel multipoint distribution service, also known as "wireless cable", or via encrypted low-power transmissions in the NTSC format.This type of distribution is most commonly used in the territories (Yukon, Northwest Territories and Nunavut), which are too sparsely populated to make conventional cable a financially viable operation.