I originally installed a&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Wilson-Electronics-Mobile-4G-Vehicle-Cellular-Signal-Booster-Kit-Retail-Packaging-Blue/dp/B00JG9O2P0/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Wilson Electronics Mobile 4G Vehicle Cellular Signal Booster Kit - Retail Packaging - Blue</a>&nbsp;in my truck and rated it 4 stars (maybe 5). It does what it is advertised to do, but my experience with it only produced marginal improvements. So why the 4+ star review? Well, if you're in an area where you have only 1 bar and you get an additional bar, that could mean the difference between a call staying connected and a dropped call. Also, the booster (I'm no electrical engineer) seems to smooth out the signal (so whatever bars you have are also more consistent (? Again, I'm no engineer). Other reviewers noted an increase in data speed, but that's something I have yet to notice.