What kit do you have as casts vary. Also you can go down the modem route which can be considerably cheaper than radio on initial setup.
Nobody's answered that yet.
Going to be about 2.5k to go from centerpoint to rtk.
Don't know if its worth it. Subscription saving will be £300 per year so 8 years to cover that.
Will own radio receiver though.
£1800 unlock is the killer. Can't transfer it to other machine either as its part of tractor.