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Improving your RF gateway range
Here is several ways of improving your RF gateway range:
use superheterodyne transmitter and receiver like STX882 & SRX882 instead of FS1000A and XD RF 5V
take a particular attention to your antenna, if you want to go to the cheap solution, put a copper wire of 17.3cm. If you have more budget I advise to take a look to this article
go close to the maximum power voltage accepted by your transmitter, for example FS1000A accept 12V. In the article above you can also see that FS1000A is giving its max power at 11V.