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South Georgia | Installing the radio at the top of the silo will work great. Running an Ethernet cable to the ground and connecting it to other equipment, especially if it is any distance at all from the silo would be disastrous. Consider installing two radios at the top of the tower and setting up a second link to the building where you actually need the network connection.
Alternatively, if you need network access near the silo only, install a wireless access point at the top next to the P2P radio. That would work great.
If you need hard-wire Ethernet at the base of the silo, then you shouldn’t go to the trouble of running romex to the top. Install cabinet at the base of the silo and use POE (power over Ethernet) to power the radio from the ground. The critical factor in this installation will be having everything solidly grounded together. Install your radio at the top. Use metal hardware to attach it to the ladder, or at least bond the mounting pole to the ladder with some 6 awg wire. If the ladder is a continuous run of metal from the top to the bottom, all you should have to do is solidly ground the ladder at the bottom of the silo. If the ladder rusty or you feel like it will not make a good secure electrical connection from the ground to the top, then I would run a single solid copper wire from the ground rod, up the silo along side the Ethernet cable (something similar to the ground wire on a utility pole). Be sure to bond the electrical ground in the equipment cabinet to whatever you are using to ground the top of the silo (ladder, ground wire, ect.). Whatever you do, do not bury runs of Ethernet cable from the silo to adjacent buildings/structures. That would be a lightning magnet. Anything connected to the silo hard-wired Ethernet should also be solidly grounded to the silo.
This was long, I wrote too much. I hope it helps.
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Lightning risks with installing ethernet cable on silo
