A field manual for the moment your phone stops being a phone.
Written for the person holding a cheap handheld with no idea what to do with it. Sequenced, practical, honest about what radio can and can't do.
If the two antennas can see each other, they can usually talk. Four situations cover almost everything you'll meet.
One channel is a single point of failure. Four stacked means the household falls through to the next without a phone call.