Since achieving spaceflight, Antica had been at war with the neighboring planet Selay. Prior to stardate 41249, Starfleet had detected Ferengi contacts on this planet. In 2364, Antica and Selay both applied for Federation membership. (TNG: "Lonely Among Us")
Later that year, prior to stardate 41775, the USS Heart of Gold was advised by the Sirius Cybernetics Corporation to take precautions in surveying Sector 500, such as avoiding certain subsectors in this sector. This request was supported by Starfleet Tactical Command. The reason given for the precautions was that the Federation was in diplomatic negotiations with the Antican government. (TNG: "Conspiracy", okudagram)
According to the Star Trek: The Next Generation First Year Sourcebook, Antica is the second planet in the Beta Renner system. The Worlds sourcebook claims that Antica is the sixth planet in its system.