[Mondial]

Looks as if there is an error on the schematic, as it can't work as shown. The two contacts marked BC and PB should be connected together, so the ant coil is connected to C412 in both positions. The switch section below then selects either the main tuning cap C405 in BC position or the push button trimmers C400 in PB position.

Make sure you have continuity from L401 to C412 in both BC and PB positions of the band switch. In addition check for continuity from C405 to L401 and C412 in BC.