Often not enough soil (e.g. small magnetic mount on the roof, motisation on rails, etc.).
With diamond mat-50 counterweight mat you can solve this problem very easily now.
The mat attaches to the metal body and connects to the antenna's soil.
At 80m the band is recommended to use two mats for it to work well.
Frequency range 7.0-52Mhz, 3.5-52Mhz with 2pcs
Power max.500 W (SSB) - 200W (CW / FM)
Connection to antenna 30cm connection cable with 16mm loop
Size 80 x 195mm about 3mm thick
Weight 55 g