Yes, you can run them all on one radio transmitter(TX). The only cavets are: you can only run one model/tank/boat at any one time and that if that radio fails or you batteries go dead you have nothing and no back-up radio. You would need receivers for each since moving them from craft to tank to car is not easy or recommended. They (RXs) are not intended to be relocated often. Aircraft use 72 Mhz and 2.4 Ghz for flying in the USA. Ground models (boats, cars, tanks, robots etc..) use 27 AM, 75 MHZ FM and 2.4 GHz in the USA. Karen's 2.4 are great deal...the cheapest I have ever seen at $90 thru the new online store (see link below). Most of us tankers modify the TX for tanking by adding a self-centering left joystick (they ratchet otherwise) and add a remote fire button for the main gun. This may not be suitable for other vehicles/craft. I hope this answers your question.

Bob
http://shop.aaftankmuseum.com/