Ebyte LoRa E220 (LLCC68) raise maximum distance

@Renzo, Excellent job, I've dug into your lib, and it is a really good job. I plan to use it in an extensive mesh network with around 40 nodes. During my tests with E220-900T22D in an open area, I could reach only a 924m distance using 5dbi antennas. This with 22db, 2.4kbps, 200bytes pack len. Have you ever run any distance tests with this module? Thanks again, excellent job.