Depending on the complexity of functions you need to control, you might consult
Kirt for his vast experience of spread spectrum model control systems. These would normally
operate in the ISM band of 2.4GHz. However, I found even these to be far from low in
price. Thus a more conventional model control kit might answer the need, operating perhaps
in the low power domestic/industrial control segment around 433.5MHz.
But, as I say,
a lot depends on the complexity of control functions you need. I am trying to find a
low cost system to control a scale model boat, so far without success, so if you come
up with a good solution, post it here.
At bottom, life is all about
Sucking in and blowing out.