I performed the tuning on the spot using only the NanoVNA, without using MMANA.

First, I adjusted the element length and angle for 24MHz.
According to the calculation, it should be300/24.915/4*0.95 = 2m86cm.
However, when I actually measured with the NanoVNA and adjusted the length, the
It turned out to be2m53cm. The elements are spaced 2m apart.

Next, I made fine adjustments to the 18MHz element length.
The calculation was300/18.100/4*0.95 = 3m94cm, but the actual measurement was3m70cm.

By the way, the tower height is21m.
The 50MHz and 7/21MHz dipoles are mounted at18m,
The 18MHz dipole is at12m,
And the 24MHz dipole is at10.5m.

In the tropical Philippines, specifically in Mindanao at the southernmost point, located at 8 degrees north latitude, I started antenna work at 6 a.m. The task included repairing the 50MHz antenna and adjusting the 18MHz and 24MHz antennas, which took until 2 p.m. The sun was beating down directly overhead, which took until 2 p.m. task included repairing the 50MHz antenna and adjusting the 18MHz and 24MHz antennas, which took until 2 p.m. The sun was beating down directly overhead, causing my skin to burn. The sun was beating down directly overhead, causing my skin to burn.

I would adjust the elements, then go back to the air-conditioned shack I would adjust the elements, then go back to the air-conditioned shack. to check the NanoVNA readings, and then back outside to continue working. I drank water several times, but I started feeling lightheaded. After lunch, I didn't take a break and immediately continued with the remaining work. I finished everything by 2 p.m. and then went to the 7-Eleven to buy a 2L bottle of Pocari Sweat for 165 pesos (about 1.75 USD).