No RSSI in Radiotap header on bleeding edge compat-wireless 2.6

[locu64]

I've just updated to the latest compat-wireless 2.6 and there does not appear to be any RSSI information in the Radiotap Header for incoming packets. Can this be corrected? Previously the driver that came with Ubuntu 9.04 gave an RSSI value but Kismet didn't like it (values from 5 to 103). I've been doing some sensitivity tests with RF attenuators and the RSSI values from the old driver do appear to follow a dB scale.