It is quite obvious that all countries, conservative or not, have and allow RF wireless remote controls. People everywhere open and close the locks on their car doors and garage doors with them. Toy shops sell RF controlled toy cars and trucks to kids. You don't have to look very far to find allowed RF remote operated consumer equipment.
That's true enough, but that doesn't mean there are no rules to follow. There are certain frequency bands assigned for this type of thing, but they vary from region to region. The frequencies used for door locks and garage door openers normally have pretty heavy-handed restrictions on the duty cycle, so you can't use them for continuously sending control signals to a remote control plane, for example. The frequencies typically used for cheap toy RF cars and trucks have limits on the power that restrict the range. There are normally limits on bandwidth and spurious emissions, and it may be difficult to determine compliance with these limits unless you have some fairly sophisticated equipment. In most places, unlicensed radio transmitters must be certified by some government agency to demonstrate that they meet these regulations, though the chances of getting caught and punished for a homebuilt transmitter are low as long as the transmitter complies with all the other standards.
Anyway, before choosing a frequency, power, and modulation scheme, you'll want to learn about your country's regulations. It's probably doable in most countries, but the precise details of how to do it without running into trouble with the authorities will vary somewhat.
In the US (and probably in many other countries), if you want to experiment with building your own radio transmitters, I'd recommend getting an amateur radio license, learning the rules, and staying in the portions of the ham bands designated for your purpose. There are other approaches that could work, especially for low power, but this is an easy enough way to stay legal and do a lot of experimentation, perhaps including high power levels. A ham license is $15 for ten years, and anyone who has completed a course of study in EE should have no trouble passing the highest level of the test. It might require a bit of study of rules and operating practices.