Radio data transmission with Arduino, which solution to apply?

Question

Arduino

Good day!
It is required to transfer data wirelessly from one Arduino to another, the features are as follows:
1. range up to 1.5 km (without obstacles)
2. high transfer rate is not required, 5 bytes / sec is enough
3. one-way transmission
4. the transmitter should not be heavier 1 kg and placed in a compact shockproof case (thunder antennas disappear)
5. delay no more than 100 ms (gsm disappears)
6. there may be no mobile communication (gsm disappears altogether)
7. high reliability
8. there are no special requirements for the receiver
Possible solutions .
1. order these modules
the problem is that there are questions about their reliability and range, and it is not recommended to turn the antenna on the transmitters, and this violates paragraph 4
2. to assemble something like this,
but it’s quite difficult and such a high speed is not
required data via gsm or strictly a mobile phone directly to another device, but I don’t understand how to approach this task, if someone tells me where to dig I will be grateful
ps I understand that some solutions may not be entirely legal, so before using I will take care of obtaining all the necessary permissions .

Answer 1

so that there is no misunderstanding, a solution is required to transfer information about tags when towing an ALS, more details here