any ideas on ground wave radio control?
So I have a pipe dream of building an extremely long range remote controlled boat (100's of kilometers). from my research it seems as if I would need to broadcast my control signal at less than 30 MHz so that the waves travel along the ground and less power is used for longer range. I am up to my ears in designs for the vehicle itself, but I am struggling as to how I would communicate data for such long distances. I have considered adapting Ham radios, and making a sound controlled robot. but this seems unreliable. So... any ideas?
Thanks for your help :)