What should be the minimum antenna height?

[sasci]

I am doing ble beacon device communication. I have two device, receiver and transmitter. Receiver device height is about 2 meter. Transmitter device on the ground. The distance between the two about 100 meter. Antenna directions do not face each other (according to the work to be done). The transmitting device (BT840F) is not visible after 100 meter. This distance not enough for me. I need to increasing. How can I find a solution to this? maybe the receiving device antenna can goes up. but I don't know what to do. 

[hmolesworth]

You might find these links useful:

range-improvement

testreport

[sasci]

hmolesworth said:

range-improvement

Parameters specified for testing in this link are similar to my test. But my antennas are not facing each other. And one of antenna is in ground. The other antenna height about 2 meter. Antenna on the ground, always at the same height. There is a pcb antenna on the ground antenna. There is 2.4GHz 5dBi antenna on the other device. In this instance communication range is about 100 meter but not enough for me.

[sasci]

About 1000 meters

[ketiljo]

Ok, that will never happen with BLE. You must find another way to communicate. UHF, LoRa, etc

[sasci]

So what would the maximum range be in this case?

[ketiljo]

It highly depends on the antenna gain of your transmitter. But I'd be surprised if you can get more than 100 m from a small device. Have you looked into long range? https://blog.nordicsemi.com/getconnected/tested-by-nordic-bluetooth-long-range

Not sure if this will be enough here though.

[sasci]

Yes, I am using this. I chose PHY Coded. Before, the range was very low.

[ketiljo]

Hmm, then you need a much better antenna in the transmitter end than what you have now I'm afraid.

[sasci]

I will try soon. I hope there is enough space to place my device. Thank you for your answer.