FCC part 15 tells you the allowed power level output at 700 MHz. It is pretty low.
You would have to operate with this in mind:
"If a Part 15 transmitter does cause interference to authorized radio communications,
even if the transmitter complies with all of the technical standards and equipment
authorization requirements in the FCC rules, then its operator will be required to cease
operation, at least until the interference problem is corrected"
View attachment 143024
there is other fine print to read.
https://transition.fcc.gov/bureaus/oet/info/documents/bulletins/oet63/oet63rev.pdf
of course, this ONLY applies in the USA.