Reminds me of the story my father told me years ago.
He was in charge of a Army Air Corp radio station in Thailand towards
the end of WWII.
The Thai villagers used to scrounge the used fluorescent light tubes
from the base dump. The Air Corp personnel couldn't figure out why until
they saw the huts light up at night. It was even more of a mystery
because the village didn't have any electricity.
The radio operators however were wise to the villagers ways.
The lights only worked when the radios were transmitting.

Darrel Toepfer wrote:
Not far from where I live, we have a 50kw AM transmitter litterally in the
middle of a shopping area. They had to use some particular shielding
tricks on the buildings to keep everything inside from being affected.

JohnMcGrew wrote:
Usually its so that when you turn off the floresent lights, they
actually do go off...