I own a 718U-5 and operate the radio as my main rig its probably one of the best they ever made, And was mainly usea as the main radio in fighter air craft and also in the big boeings 747 etc. Baruch Zilbershatz 4Z4-RB Ha-Shibolim 18 Nitzanay-Oz, Nitzanay-Oz 42836 ISRAEL mobile 0528-753838