This week, I installed extra gypsum sensors., and got a 4G WiFi hotspot for Internet access in the vineyard.
Connecting to the ESP8266 WiFi module works fine.
Tried DSL last year, did not work as the latency and slow speed was not usable., even for IoT.

Pictures below show the assembly using 3/4" PVC pipe. The gypsum sensors fit tightly in a 3/4" pipe coupler.

Recommended sensor depth for grape vines is 24", 48" and 60". For other crops, different depth recommendations may apply.

I cut pipes to the required lengths, leaving 1 foot above ground, and marking ground level with tape.

Below shows the sensors installed at 2, 4, and 5 feet depth. Recommended is to soak them before installation, and have plenty of mud around the sensor to ensure good soil contact. Solder the wire ends to avoid oxidation.
It will take 2 weeks for moisture levels to settle, only after that period the sensors provide meaningful data.

In case you are interested in the vineyard status: The vines are doing well under the new irrigation regime.
Some of the grape bunches started to show a change of color, "Veraison" in grape grower terms.