I felt the following features in the propagation characteristic of 24MHz,

it was experienced though I started the operation of 24MHz in April, 2000.

(1)　 Very deep QSB at a long cycle.

(2)　This is a propagation characteristic which has never been experienced

　　　in 21MHz and 28MHz.

Therefore, it was difficult for me to do stable QSO.

I decided the stack of the antenna to be tried to do stable QSO.

When the antenna was made a stack, the following specifications were done.

(1)　The antenna is made a structure which can be rotated by 360 degrees.

(2)　The stack interval of the antenna is assumed to be 7 meters

　　　in consideration of mechanical strength, the elevation, and the gain.

The impression actually used is as follows.

(1)　Deep QSB at a long cycle is improved and the reception signal

　　　is comparatively a stable.

(2)　The receiver sensitivity of 24MHz has improved.

Here is 5 over 5 for 24MHz and calculated patterns.

Azimuth radiation pattern

Vertical radiation pattern

Gain:(dBi)

F/B:(dB)

El:(degrees)