Total posts : 45366
If I understand this correctly the “isolated ground” is usually a stake located some distance from the service ground. This requires a ground lead connection to the stake. Doesn’t this ground lead radiate and if so does Part 15 field strength limits come into effect?
It would seem that this would put a practical limit on the power used for the transmitter which would depend on the particular installation and the operator would need to assess the field strength at the transmitter site.