Raising an antenna can improve line of sight and reduce building or terrain obstruction, but every metre of coaxial cable adds loss. At cellular frequencies, a long low-quality cable can remove all the gain achieved by the higher position.
Estimate cable loss at the actual bands, include connector losses and compare alternatives. Often the better design is to place the router or modem close to the antenna and run Ethernet back to the network, because Ethernet can cover longer distances without radio-frequency loss and may also carry PoE. The final position should be chosen from measured signal quality and installation practicality, not height alone.
Public Q&A
How should an installer balance antenna height against signal loss through a long coaxial cable?
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