Can I get a general idea of what average radio ad rates are for major
sports radio stations throughout the US. For example what would the
average rate card look like for Boston's WEEI or New Yorks WFAN 660. I
realize that these are huge markets but I figured that there must be
information on the Internet with rates for; the type of radio show (eg.
sports), number of listeners, length of ad, and time of day.

If I could get a 'general rate card' for sports radio throughout the
US, I would consider this to be a five star answer. In other words,
what can I expect to pay for advertising air-time on the major sports
radio shows in the US.

Thanks.

you would need to call the station. Stations like WFAN dont advertise
their rates. Anyway most stations dont advertise their rates. WFAN
would be more of an expensive Station.