Question about antennas. Is there a limit regarding size of an antenna that can be used on a device like the heltec t114?
For example, I have a old 8ft Lora Antenna that was used for the helium network at one point
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You should really keep your gain at no more than 3 DBI. 6 DBI being the maximum. Otherwise, you start to have problems with receiving nodes from different elevations. A 3DBI antenna will radiate and receive in a perfect sphere where a 10DBI antenna would not be able to hear an airplane, for example.