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With Bennett you can search for Bluetooth devices and monitor their signal strength.
See an overview of all detected Bluetooth adapters.
The BlueSoleil, FreeBT and Texas Instruments CC2540/41 Sensor Tag Development Kit Bluetooth stacks are supported, they report the RSSI signal strength of each device. Further, the Microsoft, Toshiba and Broadcom Bluetooth stacks are also support. Unfortunately these stacks don't report the RSSI signal strength.
You can also monitor the signal strength of selected access points in a graph over the time. With a right mouse click, you can start logging to a text file and create a screenshot.