[old_tv_nut]

You didn't say what kind of antenna is on your receiver or its orientation. I would put the transmitting dipole horizontal, but then expect to also use a horizontal dipole on the receiver, and have it oriented the same way, that is, if the transmit dipole is oriented east-west, the receive dipole should be also, not north-south. This would be the least loss in an open field; but as Electronic M says, in your house you could have all kinds of reflections and attenuations. If your house has foil-faced insulation in the walls and attic, you may get strong standing waves, in which case both antenna locations can make a difference just by moving their location a quarter wavelength.