Also keep in mind on 10 meters even your antenna is up over 1/2 of a wavelength, and thus would pick up some ground gain. on 20 meters yours is not high enough, your friends, is, but on 40 neither is even close to being high enough to having any ground gain. The angle of radiation will be more straight up on those bands as well due to the low height. Now on 80 meters your both low heights is an advantage to make us of NVIS (Near Vertical Incident Skywave). You should have great signals on 80 meters provided the antennas are long enough for 80 meters. Signals should be 20 to 30 dB over S9 at 100 watt levels. And switching to 40 or 20 meters, and you would be lucky to even hear each other.
