The kit would fit in a carry on bag and costs $300.00 total but the lightning protector alone was $73.00, well worth it.
You are lucky, many place "off the grid" here have no service but Mexico is installing a lot of towers this year.Now please don't laugh at me but a while back I gave one of those antennae away - not knowing what it was for.
We have a Telmex landline and (at the moment) a MagicJack phone. My wife and I both have cell phones (1 TelCel / 1 AT&T). To be honest - our cell phones very rarely ring with personal calls - most are solicitations. I don't answer the cell phone when it rings.
At one point I had a cheapo cdma LG flip phone with IUsaCell. That phone got a signal everywhere. Then AT&T bought IUsaCell and closed down cdma. We went to PROFECO and AT&T had to give us a free GSM phone, and restore our 4000 peso balance. The phone they gave me (a ZTE Blade) is pretty simple and gets a decent signal in the house. I think the quality of the signal has something to do with what all you are asking the phone to do (what apps are active etc). I could be wrong but that is my sense.
We are at 5900 ft and can see the cell towers further up the mountain from us (maybe at 7000+ feet).
I have AT&T which was IUsaCell before AT&T bought them. The coverage is good in big cities but non-existent in small towns or the countryside. I have a very good deal on the package from AT&T and spend most of my time in big cities, so it is fine for me. When I am spending a significant amount of time in a small city, I have a TelCel chip that I put in my phone. TelCel seems to have good coverage everywhere.You are lucky, many place "off the grid" here have no service but Mexico is installing a lot of towers this year.