Hi @everhamme, 150ft of LMR-600 will lose you about 4dB which is not too bad so locating the gateway at the base is practical.
I would use a 6dBi antenna but don’t be tempted to go further. Keep in mind that a 6dBi omni antenna will create a zone close around the base of the tower that will have poor service. Check the vertical antenna pattern.
Make sure that the antenna is on a pole or boom to keep it at least 1m (3 ft) from any structure.
To keep maintenance costs down, focus very hard on three matters;
- First, the quality of the mechanical install to ensure that the antenna will not come loose from vibration, wind, etc.
- Second, the connection of the antenna to the LMR-600 cable. I assume that it’s N-type. Use a professionally terminated cable and then seal the connection and use self-amalgamating tape. Do this on the ground. This prevents water penetration.
- Third, very careful cable install to prevent damage.
Put the Lightning arrestor at the base of the tower.
Good tower riggers know how to do all this but some are real butchers and will cost you money for repair climbs.
Lastly, commission the system carefully and measure the performance using a number of LoRaWAN devices in set locations. Record the reported RSSI and SNR. Periodically repeat the tests to check that performance has not deteriorated.
Very lastly, I’ve sent a lot of people up towers and I have the utmost respect for them. It’s not something that I could ever do!