A No one said that you couldn’t use a loop Yagi on the HF bands, but you’d really be pushing the envelope of practicality!
Loop Yagis are members of the quad family since each element is a closed loop of approximately one wavelength at the operating frequency. Line up a number of loops on the same boom and you create a fairly high-gain antenna. The loop Yagis in Figure 3 can develop about 20 dBi gain (each) at 1296 MHz, but the individual loops are only a few inches in diameter. That’s a substantial amount of gain in a relatively compact space.
But imagine supporting a similar collection of one-wavelength loops at, say, 14.2 MHz. The antenna would be monstrous! If you’re a lover of rotatable loop-style antennas at HF frequencies, a traditional quad design is far more practical.
Figure 3—Twin loop Yagis for 1296 MHz.
From QST March 1999
