(above) The L-R (left-right) indicator immediately in front of the pilot right next to the compass in an Avro Lancaster bomber. This was the radio direction aid driven directly from circuitry inside the R1155 receiver. Usually two of these indicators would have been used on each aircraft. One in front of the pilot and the other in front of the wireless operator.
(right) The R1155 receiver in this image is mounted next to the round window alongside the T1154 transmitter. This arrangement was usually used in the Short Sunderland flying boat as seen here. Note the operators morse key in front of the transmitter on the desk to the right.