After cruising in the Medd for 3+ years, we've gone a little different way. Knowing that there are 2 different sets of frequencies (the US, and the most of the rest of the world), you need equipment
that will work on the frequencies used where you're cruising. We found a digital ant and mounted it on the masthead(better range), ran LMR400 down the mast
to a selectable pair of Wilson 12vDC cell amps(one for ea freq set), then to a MIFI. In the Medd we found that buying
a MIFI from the local telecon company seemed to work better than a "one size fits all" (in the correct freq bands), and they were not that expensive. Then we bought local SIM data cards, and had pretty much any-where-we-were WiFi throughout the boat. Got here to the Caribb, and have done the same thing-ATT MiFi for the US-based islands, and a Digicel MiFi, as Digicel is in almost all the windward/leeward islands. The only issue so far....except for ATT, we need to go ashore and find the Cell phone
store to top up the data card when it runs out...ATT has a refil on-line procedure.