This antenna is similar to other loop antennas consisting of two loops connected in parallel. For example, BiQuad or BiLoop. Only in this case, the loops have the shape of a triangle. The aperture of a triangle is smaller than that of a circle or a square, so the gain of such an antenna with the same expense of materials is also less. However, Twin Delta loop antenna is somewhat easier to make.
When making an antenna, you first need to make a rectangle with sides 2 * A and B, and then bend it into two triangular elements as in the figure:

Don't forget about antenna polarization. In the figure, the antenna is vertically polarized.
The antenna is designed for a 50 ohms input impedance.
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