I have the Wilson wireless and a trucker antenna. Trucker antennas are about $40 so don't break the bank.
I bought the wireless from a seller on ebay for about half price at the time and it works to boost cell phone reception but as said above about 35 db at the best performance and it is not always that good--I have my phone set to show numbers instead of bars.
When I had a Verizon hot spot I thought it boosted that too, but switched to an iphone with internal hot spot and T Mobile unlimited wireless and I noticed during much of our travels in New Mexico we had only E (EDGE about modem speed) connection to the internet which is very slow by today's standards and won't support hot spot for my computer. (I read that turning on and off airplane mode helps to reset the connection while traveling--to find a better signal if it is available.)
Since we sometimes travel off road, my trucker antenna is mounted to the ladder where I can turn it down below the top of the RV to protect it, and I brought the wire through the floor at the rear gas pipe under the stove. I put in an extra 12 volt outlet next to the kitchen sink for its power.
The inside wireless antenna is mounted above the dinette. It is a flat oval disc that sticks to the wall.
I think the expense, given that we use internet a lot was worth it. Some folks who travel full time and work on the road get satellite internet. That will work while parked much better. I have not seen in motion satellite internet but it must exist now. Last I looked the satellite subscriptions were about $79 a month but you had to buy the gear too.