I am assuming since the studio has moved the STL link is working?
Terrestrial Rf Licensing:
Here's the link:http://www.rflicensing.com/
The cost will be $300 plus the filing fee ($125 as I recall--it's on their website--no fee if the station is non-commercial)
Your friend will need the coordinates of the studio site, and transmitter site; and the ground elevation and height above ground of the antenna at both sites. Type of transmit antenna, type of receive antenna, type of STL transmitter, and the length and type of coaxial cable from transmitter to antenna.
Finally, if you want Terrestrial RF to file the application, he will need the FRN and password for the FRN for the station.
The application also asks for the emission designator, but this is irrelevant as the Wireless Bureau only seems to recognize three: 180 for a mono, 300 for a composite, and 500 for a digital. What the manufacturer lists is not accepted (unless it's one of these three) since the FCC computer won't recognize it.
Seems to take about three or four months to grind the paperwork through the Commission.