The string EM97XH25AO is a highly precise 10-character Maidenhead Locator (also known as a ham radio grid square).
https://en.wikipedia.org/wiki/Maidenhead_Locator_System
When decoded, this alphanumeric code pinpoints a specific geographic coordinate on Earth:
Latitude: ~37.3150° N
Longitude: ~80.0665° W
Breakdown of the Code EM97xh: This is the primary Maidenhead Locator, which maps directly to Salem, Virginia, USA. The grid square covers parts of southwest Virginia and West Virginia.
25AO: This acts as an extended sub-grid modifier, defining a hyper-specific, pinpointed geographic sector within the Salem area.This string format is typically generated by amateur radio software (such as WSJT-X or ADIF log management tools) to pinpoint an operator’s exact broadcast or reception location during a contact.