Adam Doud/ZDNET Follow ZDNET: Add us as a preferred source on Google. ZDNET's key takeaways I tested 5G on country roads and farmland for three days. The results were predictable in some ways but surprising in others. I found 5G in a tiny town my ancestors founded in the 1800s. My quest to test 5G has taken me to a baseball game and interstates between Chicago and Nashville . Through the journey, I've carried three phones from the three major US carriers to determine which has the best coverage. I just did it again, but I changed some things up. Also:  I compared Verizon, T-Mobile, and AT&T 5G coverage on a road trip - and the winner surprised me I still packed my car for a weekend away, and I still had three phones riding in the back seat. I used nPerf (more on that later) to continuously run and test carriers and network performance for the entire journey. But this time, I went a little John Denver on you and stuck to those old country roads. Interstates were off the menu.…