Spektrum was layed into the AQ´s cradle - but other radios also work perfectly like Graupner (special HoTT Telemetry version available) and most PPM receivers do work, also SUMD and S-Bus, you name it...
Spektrums and Graupners are the most common used radios afair.
http://autoquad.org/wiki/wiki/configuri ... adio-types