OP has a RV8
The OP has a RV8, not sure if that plate works as it's intended for a RV7/9
I used a cutout of the instrument panel as a base, with a couple of 3/4 in. angles riveted to the side longerons.
Antenna is the short version from ARTEX, made a small bracket and it's mounted just aft of the front seat brace. I might change the bracket for a slightly thicker version.
2022 =VAF= paid
RV-8 SB #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
C-GEMQ, RV-8, "Dragonfly", flying
C-GNFJ, C72R Cutlass, flying