开云体育

The 40m band antenna of my station JE1TRV was AFA-40, 2 element phased array made by Create Design Co. Japan. Photo attached.
As you know, high level of noise is the biggest issue when receiving DX signals and, vertical antenna is good for DX but not so good for receiving noise.
As same, Inverted-dipole is worse than horizontal-dipole on receiving noise level.
Many says, Loop antenna is better than dipole on receiving noise level.
Hiro-san, you have good antenna tower so try to put up horizontal or loop antenna.
73 de JE1TRV Atsu