4G LTE Coverage in 20716 area is intermittent, at best.

[YVG20716]

Receiving/Sending email/texts/calls, in my home and outside my home, is very spotty.  I spoke with a VZN rep who suggested that my phone may be the issue because they weren’t showing any issues in my area.  However, I have had 3 different 4G LTE phones (2 Android and 1 iPhone) with the same issue; current phone is Android.  My son has an iPhone on my account and has the same problem, but his father has an iPhone with a different service provider and does not have this issue. There are times when I need to get information to someone and am forced to use my laptop.This is very frustrating!!

So, what could be the problem?