As the SOE had their own aircraft, and there was no need to make the system work with an existing production radar design, the solution was relatively simple. Instead of the transponder replying on the same frequency, and thus being lost in the ground reflections, it would receive the signal from the radar and then re-broadcast it on a second frequency. In the aircraft, the receiver would be tuned not to the radar's broadcasts, but the transponder's. This way the ground reflection would simply be ignored, although at the cost of requiring the transponder to have two separate antenna systems.