General view showing the location of the panel behind the front wheel. This is the right-hand side, where it seems common to mount the aerial on right-hand drive cars at least i.e. the drivers side, possibly to be clear of pedestrians when parked on the correct side of the road. Normally it is recommended that the aerial be mounted on the opposite side to the ignition system to be as far away from interference as possible. However Clausager shows both right- and left-hand drive cars with some having it on the driver side and some on the passengers in both cases, so no consistency there.
The top of the main splash panel with three bolts, with the smaller panel and seal just visible above the box-section at the top right.
The bottom of the main splash panel with three bolts visible, the 4th bolt is out of sight where the very bottom of the panel turns under the sill.
Showing the box and 'trumpet' section and how they relate to other parts of the structure. This picture starkly shows the rot that can develop, in this case on a roadster. The top of the trumpet section (in front of the splash-panel) is the most prone as there as a flat 'shelf' that is a great receptacle for water, mud and salt thrown up from the wheels. the top of the box section is protected by the splash-panel, but can still rot as shown here. Lyndsay Porter's 'Guide to Purchase and Restoration of the MGB'.
Any retracting aerial, either manual or motorised, needs to be positioned somewhere inside the yellow box, in this case a GT. The arrow indicates the hole for the aerial cable, the four other holes in a vertical line close to the A pillar are for wing bolts. KGC Engineering