A couple of years ago I built a range extender (actually a repeater) out of a Linksys router running DD-WRT and the Linksys larger antennas. It worked pretty well for bringing in the weak marina signal - for a while. But weather and a big fishing boat all played a part in how good the signal was. All in all it was a pain in the ass and I could pretty much count on the signal dropping out exactly when I really needed it to work.
For a while I used a portable hot spot from Comcast until they discontinued the service.
These days I use a smart phone as a hot spot since I have unlimited data on my plan from work. Check and see what the coverage is for T-Mobile in your area (they offer unlimited data). If you have good coverage go for it.
With the phone as a hot spot I can stream video from NetFlix to the TV using my laptop and a video cable.

For a while I used a portable hot spot from Comcast until they discontinued the service.
These days I use a smart phone as a hot spot since I have unlimited data on my plan from work. Check and see what the coverage is for T-Mobile in your area (they offer unlimited data). If you have good coverage go for it.
With the phone as a hot spot I can stream video from NetFlix to the TV using my laptop and a video cable.