[jyl]

I am thinking you should contact a networking guy to come install business level gear - treat it like a mini school campus that you want to blanket with Cisco Aironet or Ubiquity or other enterprise APs. Including the driveway and as far down the street as you can get with an AP at the corner of your property. The hope would be that as you drive toward your house, your phone grabs the WiFi before the cellular drops.

Deduct as home office expense, perhaps.

Oh, also, have you looked into installing cell signal boosters in your cars? I don’t know if they work, but they are out there.