I also just changed to the new Verizon unlimited data plan. I use a Wilson Sleek and their Home and Office kit. That most always results in a gain of two bars.
A couple things about the plan.
You get 22 gigs of 4G and then MAY be throttled. But if you use a phone as a hotspot or hook up a Jetpack, you get 10 gigs of 4G (when using as a hotspot), then unlimited at 3G speeds. My cost for a phone line is $80/month if you go paperless and autopay (debit only). I can add a Jetpack for $20/month and it will come with it's own data - not shared.
You will see Verizon advertize "Unlimited data for $45/line". That is for 4 phones. It's $100 base plus $20 for each phone = $180/4 = $45/line using paperless billing and autopay.