I'm trying to build a transmitter - and had issues initially with some easy radio modules, I've now got some LINX modules which I'm having much more success with tho my range is somewhat limited (about 150mm) the guide says they are good for 3000ft! I was thinking my issue was in the antenna - but surely it can't make that much difference? (can it???) All i've got for an antenna is a 170mm length of wire stuck onto the ant output on the module. The module is 418MHz - any ideas? Should I double it to 340mm to make a 1/2 wave?