Thanks for the response!
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Sounds like for the cellular antenna I need to just find the right one. Making my own would be a challenge lol.
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The chip antenna diagram I was referring to is page 2 of the datasheet but I don't think I'm going to use this chip antenna anymore (it's too long).
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I think I am going to switch to this GPS chip antenna because it's much smaller/shorter and has a higher gain than the other one.
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So if the chip antenna specifically states that its impedance is already 50 Ohms, I still need to worry about making the feed line 50 Ohms? I thought the impedance matching is between the cellular module and the antenna, and if the antenna isn't 50 Ohms then that 50 Ohms has to be from the trace that leads to the antenna (feed line).
Thanks!