The key to executing a plan that captures the Authentic image is to build a list of the most important qualities and traits that are the core or foundation for the brand. Once you have those don't compromise them. Also build your imaging around those qualities, but be careful not to over claim or over-hype.
Much like leadership or humor being Authentic is something you earn. You can't buy it, inherent it or just claim it. But, once you have it you often have a quality that goes beyond the superficial and that's where the magical power comes in.
As you set your values in Music, Imaging, Promotions, and the Personalities that make up your station and brand take a long look at the core qualities -- they are your key to achieving Authenticity.