It sounds from the article they likely do know where the antennas are based? If not, is it possible to use direction finding to obtain the location of antennas

It sounds from the article they likely do know where the antennas are based? If not, is it possible to use direction finding to obtain the location of antennas propagating shortwave frequencies? (I assume this is more difficult due to the use of the ionosphere) Also is there any remote chance the hardware attached to the aerial (power amps etc) could pick up unwanted RF or other interesting electrical interference and re-broadcast it, which may give some useful information.