Harder then it sounds
It's a bit more complicated then the article suggests, but should be possible.
EPLRS, for example, does most of this. Think of it as a data communications network that also provides you relative position information and has the capability to add a PLGR (Military GPS) or other position location information. When enough stations know where they are, suddenly the whole network can provide absolute position information as well.
The tricky part is to be able to dynamically assign beacon status to emitters not part of the network- For example, a TV tower. First, you have to identify the location of the tower itself. DF gear would make this much easier, but that's generally not included in stock commo equipment. You could play some tricks with signal strength from multiple receivers. Or you could allow operators to manually assign location and approximate signal strength.
Next, you need to be able to calculate location from the beacon. EPLRS uses time to detirmine distance, and I guess if the beacon varies in some manner (As a TV Broadcast would) you could play some tricks and do something similiar- But then you would require contact with your data network to make use of the position data provided by the non-network sources. It's still better then the current solution, as if you currently have direct contact with only 1 or 2 remote stations, you can't calculate position information.
Signal Strength would require contact with the network for initial setup of the beacon, but not afterwards. However, various terrain irregularities could case a "spoofing" effect, under precisely the same conditions as you would need to use it. Trees, buildings, cliffs, etc, could all cause either loss of strength, or create reflections that apparently increase signal strength.
Again, DF gear would seem the best solution (if you have to use non-system transmitters).
Even better might be integrating an EPLRS-style system, military grade GPS, and inertial. As I recall, HTU equiped Avengers (as an example) have all 3 systems, but gunners and slew-to-cue only make use of GPS and inertial, while the TOC receives information from the GPS and EPLRS systems. Scrap the whole nutjob use TV stations as GPS Locations (Like there is really an accurate database of MAC/Location information in a war zone, Lewis?), or just pay it lip service, add an extra ADDSI connector to existing equipment (Or an ADDSI hub device), update some firmware, and win.
Spend the rest of the cash on helicopters.