Sorry you asked now?
Not at all. Thank you everyone who added to the debate. I was a bit unclear how the 'power' went from "50kW ERP is actually 500 watts (peak) of RF, and with a duty cycle of .00375, is only a few watts". Now I know.
Doesn't take much power to reach the upper advised limit (10mW/cm squared).
Thanks all who contributed - I'll make sure I keep "13ft for the Honeywell RDR-4B on large Boeings and Airbus" away when its wx radar is on....