G5RV(3.5MHz to 28MHz band) have 2 of 15.5m length antenna elements and 10m length balanced feeder. I tried special inverted L antenna which means half element of above G5RV. So this inverted L antenna have 1 of 15.5m lengh antenna element with 10m lengh of 300 ohms balanced feeder.

Fiber rod and antenna element at the UnzenKanko hotel in Nagasaki. Coil on a pet bottle (wind about 5meters antenna element.) 10m length 300 ohms TV feeder on the balcony at the Unzen Kanko hotel QRP rig FT-817 and coil of pet bottle out side window.   Small key on the FT-817, T1 antenna tuner and balun. FT-817 and Balun which wind 1.5D2V(right) SSB operation by JA3NEP

JA3NEP and Unzen Kanko hotel which open in 1932
This hotel is very nice and history at the in front of the hall.

Result

Here was hevy noise on 7 and 10MHz bands. I imagined that a magma chamber make a bad effect for radio noise on HF bands. Also Unzen hot spring area is surroundings with high mountains almost 360 degrees. So It is not good location for DX so I only contacted with JA1 to JA6 areas, HL and BV stations on 7 and 10MHz band.