It is a simple and relatively inexpensive modification to install an antenna and ground plane on the wing or fuselage. A hand held aviation band radio connected to the antenna is usually equivalent to a nav/com. I’ve done this in two Aeronca 7AC. I did it as the owner and made a log book entry. It gave me peace of mind. But I must admit that my very rare near collisions in the airport environment were in fully equipped small singles.