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OOOOOOH! The coax is about 1 meter in length. The client has an installation with a 50ft coax; and, much to my surprise it actually works. I think the stations are only 1000 feet apart. The NRF24L01+ was not my choice in radios. The customer already had the hardware assembled, but couldn't get the software working. (Student labor is a big mistake)

The Dubai project will use little bat antennas with about 2 meters of coax. They are supposed to last 5-10 years on a C sized lithium primary.

Next radio project I get strong-armed into will definitely make use of something like a RFM69HCW. I'm not fond of radio projects.

I had a nice setup going with DIGI HP900 S3B radios; but, the customer canceled the project:

OOOOOOH! The coax is about 1 meter in length.

A meter is not bad. I was looking at some cable specs for what I assume you are using and they range from about 11 db/100' to 17 db/100'. Not all that much of a loss at 1 meter.

The client has an installation with a 50ft coax; and, much to my surprise it actually works.

With around a 6db loss both ways through the cable, but if it's not too far apart, I can see it working.

Next radio project I get strong-armed into will definitely make use of something like a RFM69HCW. I'm not fond of radio projects.

They also make a LoRa version.

https://www.hoperf.com/modules/lora/RFM95.html

I had a nice setup going with DIGI HP900 S3B radios; but, the customer canceled the project:

That looks like a better device for long range communications.

From the specs. "Transmit power output 24 dBm (250 mW) (software selectable) "