Tvheadend

I'm using a PCTV nanostick 73e with a raspberry Pi with Openelec to get DVB-T channels on Tvheadend. Unfortuantelly I get very weak signal compared to what I get using the original software on windows. Since I found on other forum that sometimes the problem comes form the USB port not supplying enough power I already tried to connect it on a powered USH hub, but without any improvement.

I found that one of the possible reason is that the LNA on the stick doesn't get activated. So I added the following line on "/storage/.config/modprobe.d/options.conf" file:

options dvb_usb_dib0700 force_lna_activation=1

Now when I type:

cat /sys/module/dvb_usb_dib0700/parameters/force_lna_activation

I get 1, meaning that the parameter is active, but there is no improvement. Even like this I get very weak signal and many muxes that are easily visible using the windows driver are not working on openelec.

Does anybody have any idea if there is some other thing that I should try to make it working?