Minority and small business groups are hoping to derail the FCC’s scheduled Aug. 9 auction of wireless spectrum space in an appeal to the 3rd U.S. Circuit Court of Appeals that challenges recent changes to the FCC’s bidding rules.

Dubbed “Auction 66,” the sale has been in the planning stages for years and promises to be the largest spectrum auction in U.S. history, raking in up to $15 billion and potentially bringing high-speed digital communications to even the most remote areas of the country.