I tried to find some info on this power on any Star Trek site, but didn't find anything on personal cloaking devices.
It was mentioned that the Hirogen ships have a "stealth mode", whatever that means.
I'm assuming it's their version of a cloak, but it could also be a sensor masking unit making the ship undetectable, but still visible if you were to look out the window and see the Hirogen vessel directly.
That was the only information I was able to find on the Hirogen's cloaking technology.
And Romulans (as far as I know) have not developed personal cloaks, so they could not have supplied this technology to the Hirogen.
Has it ever been shown in a tv episode that the Hirogen have a personal cloaking device?
If so, can you cite the series and episode so I can see it for myself?
I submit to you that the Hirogen are basically Yautja (Predator) expy's so it stands to reason they'd have a personal cloaking shield. Now if we can only convince the designers to give them those snazzy helmets...
"In game", I think that has been in for a long time. I think a barely used Tactical Kit power does this effect as well.
But on the show? I don't remember the Hirogen well enough. I remember that another "hunter race" in DS9 where their prey, "Tosk" was capable of cloaking. And the Jem'Hardar have a personal cloaking device.
it is possible the Hirogen developed them on their own? Maybe after they learned more about the holographic technology, they build a personal device to get a cloak-like effect?
It could just be a holographic masking unit, with no sensor masking abilities whatsoever.
That would be good for observing non-advanced species, who did not have the capability to detect the "invisible" individual.
Of course, it could be Sona technology, which was being heavily used in the attempt to move the Ba'ku to another world.