I built a handheld antenna, with a length of about 20 meters. After bending it, I secured it with rope. During my vacation at my hometown, I tested the standing wave on the mast. The lowest frequency point was below 7 MHz and relatively far away, while the other three bands were slightly higher. This doesn't seem to match what I expected, and I'm a bit confused. Could an experienced expert help me diagnose whether this is normal? Also, should I trim it or lengthen it?
The video transmission has stopped working; the specific values are as follows:
5.64 MHz: 1.14, 14.63 MHz: 1.69, 21.59 MHz: 1.41, 29.42 MHz: 1.42.
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