Head south on the minor road from Cairn Gleamnach and you'll reach the the Drumderg Wind Farm. I parked at the large area near the locked gates. It says danger to walkers, I ignored this thinking it highly unlikely a turbine would land on my head.
The standing stone is about a 400m walk from the road and is to the north side of the track. It is impressive, well shaped and stands at 2m tall. Well positioned it has fantastic views, the Lomonds (in Fife) to the south, west to Gleamnach, east to the Angus hills and north to Glenshee.
One of the Scottish Megaraks, George Currie, mentioned this stone to me. It's not marked on the OS Landranger map, but it's most definitely there. 200 m or so in from the road, just off a rough track. About 1.7 m tall, and 0.7 m wide, it stands proud with a terrific viewpoint north, west and south, just on the SW shoulder of Drumderg. It's obviously a great favourite with the sheep, too, as the eroded area round the base and traces of wool on the shaft show. From one angle it looks a bit like an upright axe-head.
The cairn at Rannagulzion is a short walk east from the standing stone at Drumderg. Follow the track, head south east at the crossroads into the heather.
Turf covers the site but one or two bits of cairn material poke through. It sits at nearly 7m wide being 0.5 tall.
Sadly the cairn at NO 1747 5494 could not be found.