Older versions of the Radiohead library did not configure the LoRa device correctly for the built in long distance mode, the latest, 1.82 appears to be correct.
The range you get depends on a number of factors;
how the antennas are connected
the LoRa settings (bandwidth, spreading factor, coding rate)
Whats between transmitter and receiver
the transmit power you are using.
Thanks for reply srnet.
Ive just checked i am using the latest version of the radio head library. i also understand the relevance of what else you have said too.
The tests i have performed is that i get stronger signal strength for a larger distance just using a solid core wire attached to the radio ant pin, when i attach a proper antenna my rssi drop from -20 to around -40 , unable to understand why this happens tho. i have one arduino attached to the side of my house atop a 3m ariel pole so a total of 8 meters high , the tx power for both is set at 23 and using the default modem config i have also used other variations but still no improvement