Tradio is a type of phone-in radio program formatted to provide a venue for listeners to freely advertise items they have to sell or trade.
Since the increased prevalence of e-mail and other electronic media, most stations permit the sending in of items to sell via e-mail or fax, though due to regular and/or identity theft concerns some stations will assign a code number to anonymize the transaction and keep identifying information off the air.
Federal regulations prohibit the sale of firearms through these services; real estate is also usually not allowed on tradio programs.
A similarly-styled program titled Wheelin' and Dealin' with Dave Ramos also airs during the weekends on WTAM in Cleveland, Ohio (but is not in a regular timeslot).
Various Tradio programs have been the target of prank phone calling by The Howard Stern Show's Richard Christy and Sal Governale.