VK3YE ( search youtube for VK3YE ) has several videos on Experiments with low power UHF transmitters in which he performs some range tests which may be of interest to you.
If you are looking for somebody to tell you to use product ABC then you probably aren't going to get that. Here's why.
First, different receivers have different sensitivities. A really good receiver may be able to pick up a weaker signal than a cheap one and therefore give you greater range. Only way to know is to read the specs (assuming they are valid) and then test the receiver yourself.
Transmitters may produce different levels of power which might affect the range. Again read the specs and test.
The antennas used, both transmit and receive, will make a huge difference. An omnidirectional antenna will radiate the available power from the transmitter in all directions therefore the signal in any one direction will be weaker. A directional antenna will tend to focus the radiated power in one (or two) directions and therefore the signal could be greater at a distance but only in that direction.
At the higher frequencies the RF may bounce around off of all sorts of objects including buildings, hills, walls, vehicles, towers and trees which could mess up the signal at the receiver.
You are going to need to do some homework and read up on RF transmissions and propagation, study specs on available transmitter/receiver pairs, choose a product and then perform lots of testing.
KM4FER