One thing we all need to understand is that television stations are regulated on how far the transmitted signals can carry. They are not allowed to interfere with other metro transmitter areas.
This circle is on average 60 miles (larger in less populated/less in heavily populated areas).
I am quite sure that companies like Winegard could produce a higher amplified antenna but may be limited by FCC.
Since the amount of people who camp is a small percentage of world population, and the percentage of campers who take part in "Open Roads" is even smaller what we do does not bother the FCC.
We can buy better antennas and amplifiers to increase our range for picking up "free" over the air television (at home or in a RV). A second "in-line" amplifier is an in-expensive way of increasing our range on a current directional antenna.
While in the recent past I would have expected my amplifier to also work with the Jack antenna too, I am not so sure now. Some people are having problems using new Jack antenna on the Winegard system.
No one has mentioned adding the second amplifier on a Jack Antenna system yet. I am happy with my current system and have no reason to check the Jack.
By the way. Arguing over what to call a antenna is kin to arguing over whether an MH is a Class B or a Class C. IT DOESN,T MATTER!