Receiver and transmitter at 433 MHz: antenna and range. How can you get a longer communication range?

Question

Electronics

Good day! Help, please, to solve the problem.
There is a microsatellite, for example, CanSat format, it is necessary to establish communication with the station at a frequency of 422.4 - 434.1 MHz.
Any radio communication module you offer. The main requirements are a low price (no more than 2,000 rubles abroad) and a fairly small weight together with an antenna (no more than 300g).
The satellite rises with a helium balloon to a height of 10 km and remains at this height. It is necessary to keep the link at a distance of 10 km (the more, the better).
As far as I understand, this range belongs to the class of decimeter waves, which tend to scatter on the inhomogeneities of the troposphere, which increases the communication range.
Examples of similar projects:
Earth Orbit - ArduSat.Module - NanoCom U482C.
Stratosphere - Cubex. Module - Si4464.
What answer do I want to get: which radio communication module from this range is better to use and why, the communication range with certain antennas.
UPD: I decided to switch to ZigBee.

Answer 1

They talked about Zigby.
There are RFM23BP modules from HopeRF, up to 1 watt. Frequencies 433, 470, 868, 915 MHz. The frequency is adjustable over a wide range. The price tag is around 11 bucks.
Lower baud rates (say 300...1200 baud), packet duplication, redundant recovery, and frequency hopping to bounce back from sudden powerful interference are key to success.
Check out the 3DR radio telemetry project. There is very good noise immunity

Answer 2

Why in the subject 433 MHz? This is the civilian LDP band and there is a lot of interference on it.

Answer 3

UPD: I decided to switch to ZigBee.

ZigBee is not intended for long distance communication. This is a bad decision.
You didn't say what data rate you would have. A lot depends on this. You can, for example, use LoRa transceivers from Semtech and get a distance of 10 km at a speed of 500 bps with an output power of 20 dBm. If you put an amplifier, there will be a large margin.

Answer 4

Surely, this "satellite" will have GPS.
Ground solution:
1 W, director or patch antenna on 2 servos (pan/tilt), arduino as a controller and the simplest software that builds a vector to the target according to the coordinates transmitted by it.
Air solution:
10 mW, unequal length wire collinear hanging down.
What such a scheme will give:
low weight of the air part, low cost of the air part (the receiver is much the simplest there), low power consumption of the air part.
Cons:
It will collect interference from a very large area.
Lightning will come with love to a meter rod at a height of 10 km.