Total posts : 45366
Yes as long as you are in compliance with either 15.209 OR 15.219 (as allowed under 15.215) you are legal. Note that 15.219 limits the antenna, ground lead, and transmission line lengths to a TOTAL of 3 meters and power input to 100 mW. The FCC rules do not define a range limit for part 15 AM
If you can certify and demonstrate that your field strength meets the requirements of part 15.209, regardless of the limits of 15.219, then you can operate under that rule.
Please read rules 15.209, 15.215, and 15.219 and tell me your interpretation.