I got an email this morning stating that some Polar sensors can be updated to do ANT+.
Polar devices have had the dual Bluetooth/ANT+ chipsets built in for a long time but the code wasn't present for ANT+. Apparently a firmware update enables it on a couple of sensors including H10, OH-1 and OH-1+.
https://www.dcrainmaker.com/2019/03/...ge-series.html
-Tim-