The strings of letters are contained in the lines of text on the side of Boalt Hall.
Counting how many letters remain gives the following sequences:
|
3,1,1 1,3,3 1,1 3,1 1 1,3,1,1 1,3,1,1 1 |
1,3,1 3,3,3 3,3,3 3,3 1,3,3,3,3 1,1,1,1,1 1,1,1,1,1 |
In Morse code, the dash is three times longer than the dot. Using Morse code was also clued by the title ("radio"). Translating these to Morse code gives the following phrase: DWINELLE ROOM 155.