would it be possible for a operator, or 3, to triangulate their issuance points?

Yeah, it took me a minute to find but there's a pretty interesting paragraph on wikipedia

"Also, several articles in the radio magazine Popular Communications published in the 1980s and early 1990s described hobbyists using portable radio direction-finding equipment to locate numbers stations in Florida and in the Warrenton, Virginia, area.[9] From the outside, they spotted the station's antenna inside a military facility. The station hunter speculated that the antenna's transmitter at the facility was connected by a telephone wire pair to a source of spoken numbers in the Washington, D.C., area. The author said the Federal Communications Commission would not comment on public inquiries about American territory numbers stations."

How the fuck do you get this to play on windows? There's no .xxx to identify.

It did the same thing when I tried, just use 'open with' browse to C:\program files\windows media player or wherever and then use windows media player

It's not much to listen to, 'uno cinco cinco cinco quatro etc...'

The fact that encoded messages are being sent at all tells the enemy something, so you send random garbage when you're not sending messages to obscurify the amount of encoded traffic.