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thats a waste of your money, with power output like that keep the coax cable as short as possible.
And the antenne length as long as possible.

Even with higher power this will be better since the losage of the received and transmitted signal on vhf bands goes up very fast.
the higher the freq the less signal is left with long coax or you are using ecoflex 15 for example but thats 15mm thick an the connectors give something like 0.1 db loss as well

Be sure that the Swr is right as well, not that it will break your rfx fast with this little output but still.

b_weijenberg wrote:You can try with an external antenne connected to the sensor for example
http://www.ebay.com/itm/Antenna-433Mhz- ... em2577763d

Anyone ever tried this antenna?

Did not try with this 2dbi SMA plug male 3m but I think it will not help unless you can place the antenna at a more factorial place. The 2dBi antenna gain will be mostly lost again by the three meter cable.

Moving the antenna a meter can make a big difference but you can also do these experiments using the standard antenna.