AN/ARA-8 was homing device but VHF and no HF and cooperating with VHF radio SRC 522 (4th chanel was usually preset for this purpose).
HF homing device was Detrola but beacos (system had ground beacons) were only placed in the US continental territory it was reason why this device was usually removed from aircraft and wire antena was for it (often missing on photos of WWII Mustangs).
(may be, some beacons were placed outside of the USA, my info comes from one source)
And, I would like to hear somethig about possibility to have P-51D "model 1944" in DCS WWII too. Without K-14 for instance and another "late" model equipment.
Thank You