yes, but later you won't be possible to use the newest garmin collars - tt10 and tt15 if you wish to buy additional collars in future. They are only supported in the latest fw. Second if you are in a hunting group check to see if the other hunters use astros on the us freq. If they don't i don't see a reason someone buys astro form USA. If you calculate the price it is the same as you would buy it from eu.
btw i have an us astro and dc50. if you wish call me and i can send it to you. We are not so far away. it is almost new.