I have a pair of these:
Two RF Wireless modules with the USB converter and the two antennas and I managed to make them work. I have the one connected to the Arduino and the other on a laptop and I'm getting some measures to the laptop. The Arduino is inside a small metal building. When I am in a range of 80-100 meters around of this metal building with the laptop on my hands and the module on it, I have good connection. However if I go a little bit far from this range I lose connection. I want to succeed a bigger range so the laptop to be in a distance of about 450 meters from this building in an office.
How can I do this? Can I search for a longer/bigger antenna or something? And if a longer antenna will work, what type is the best to use?
Working frequency of these RF wireless modules is 431~478Mhz and I use 433Mhz
Also, the manufacturer says 1km range. Probably they're talking about straight-no wall communication