Bluetooth locating with RSSI and only one receiver Is there a method to find the relative direction of a Bluetooth device to the receiver?

A quick Google search on "Bluetooth positioning" returns several methods using triangulation, but I don't want to use multiple receivers. Also, I don't need to know the distance, only the relative angle to the receiver is enough.
If the environment does not contain a lot of 2.4 GHz radio reflecting objects, you can try shielding one side of the BTLE receiver's antenna (it might be tiny) with a large conductive object, the rotating the shield and antenna configuration.   The difference between RSSI's will be greatest when the shield is between the source and receiver antenna compared to the opposite orientation.