Below is a picture of the Navy's wireless laboratory in the North end of the fourth floor of the East Building (December 1915). Note: the standard capacitor and inductor on the table and the two-coil direction finder on the right.
To the right, is a picture of an antenna mast that buckled in a snow storm in March of 1914.
It was located just east of the East Building. Only known antenna associated with the East Building.