can i change the tuner to a stronger one?

[schnecke1]

because we work here with weak signal, uk tv in spain, (1.9m dish!!), but we cannot get all the channels (transponders), on the openbox.
on other boxes we can.
on the dm 800 hd for example is a stronger tuner, and you can change the tuner.
can i change it on the openbox?
thanks
el pirate