I don't know what the name of this thing in the picture below is, but it is definitely available where someone lives. Choose the 26 cm, remove the two ears and it will look like the picture on the right, which is just suitable for use as an antenna.
The main materials are ready, and then to understand the basic structure of the back-firing antenna, see the figure below.
The reflector in the picture is made of the object in the picture above, and its size is surprisingly suitable.
The measured antenna has a gain of 4 decibels lower than the 60-centimeter parabolic antenna, but the material is easily available.

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