That’s a complicated topic! Probably too long to adequately summarize here - there’s a lot of reading you can do through google to understand the options.
One place you could start is my blog post (I recently had this same question): https://svviolethour.com/2020/08/23/adding-cellular-internet-enhancement-to-our-boat-something-we-never-expected-to-do/ The tldr is that you may not need a booster. I’m still thinking of testing a booster at some point, but it’s not needed for where we cruised this year.
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