It is attached with adhesive putty and comes with a carpenter jack.
Below you can hear a recording of the Radius through the AER alpha plus.
For the recording the Radius was placed on the bottom under the sound post, which gave the most balanced sound.
I have used the AER's eq but not the reverb. You can see the adjustments from the pic. below.
Below is a couple of sound samples recorded directly no eq. or effects.
Sample with the Radius placed in center behind bridge:
Sample with the pickup placed at the G-string side behind the bridge:
Sample with the pickup placed at the E-string side:
Radius mounted on the bottom under the sound post: