Is 6ft too tall for your attic? Although vertical is more efficient than horizontal, you could literally cut this design in half and mount the two antennas side by side with 6.75”(1 quarter wavelength) of space between the sides of each DB4’s bowties. The ideal distance would be one full wavelength of 27″.
When you join the antenna transmission lines, join left to left and right to right at a 45 degree angle downward towards the balun at the center of the two DB4’s. I’ll post a more in depth article about how to do this in the future. Let me know if you are interested.
