Well, what kind of radio are you looking to prototype? Is this a radio receiver? What band are you looking to receive? FM, AM, K etc?
If this is a transmitter, what band are you looking to transmit? For what distance range? etc.
Are you looking to create this radio for commercial, industrial, military use?
What kind of power supply are you wanting to have? battery power? What type of battery? Volts etc.
What kind of enclosure are you putting it in? Plastic, metal, etc.
What cost are you willing to spend prototyping this radio? At what cost are you willing to produce this radio? At what cost are you planning to sell this radio?
I suppose the point is, more information is needed. If you team up with a prototyping company, they'll be asking the same questions, and more.