 New York's Metropolitan Television Alliance was to run similar tests, but on a larger scale, in 2007 and 2008.While the US Federal Communications Commission has supported DTS in principle since 2004, an FCC call for public comment at the end of 2005 garnered a wide spectrum of responses in early 2006, ranging from strong support by groups such as the National Association of Broadcasters to widespread opposition by groups who advocate the free use of "white spaces" (unused broadcast frequencies) for non-broadcast purposes such as wireless data.The FCC granted six-month special technical authority to WTVE Reading, Pennsylvania in December 2006, allowing it to operate a distributed transmission system on an experimental basis but did not authorise the systems on any permanent, licensed basis at that time.