Keep in mind that the sensitivity might vary wildely on 700 Mhz from one unit to the next. One unit might work fine - another might be as deaf as a stone. This radio was never intended to cover this band, so it's really not so surprising.
And please, keep in mind that rebanding has absolutely nothing to do with 700 Mhz. It's another myth that keeps on rearing its ugly head from time to time.