Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/snake_loving_nerd on 2023-06-27 17:02:34+00:00.

ELI5 why internet service coverage is how it is- i was looking into getting a different internet provider, but what i wanted isnt available for my address. when i checked the coverage map, it shows covered areas surrounding me, but not in my actual area, less then half a mile away from the covered areas. and theres quite a lot covered around me. why does it work like this? (i apologize if this is the incorrect way to post this question, i just want to clarify what i mean)