Meanwhile, it appears you can earn 1 mile per dollar at Radisson if you book through the UA shopping portal.
Thanks for the tip. It looks like having one of the Chase United cards gets an extra mile (2X total) and if I then charge it on a Chase Sapphire card I can get another 2X UR points which can also convert to UA miles for a total of 4X UA miles. Not a bad alternative vs using the cash back sites.