I do agree, but to be fully pedantic, L1 and L2 are hand-wound microwave chokes with very high self-resonant frequency, mounted perpendicular to one anot

I do agree, but to be fully pedantic, L1 and L2 are hand-wound microwave chokes with very high self-resonant frequency, mounted perpendicular to one another and clear of the ground plane. Wind 14 turns, air-cored, 1mm inside diameter from 7cm lengths of 32swg enamelled copper wire. Checked with the tracking generator on a Marconi 2383 SA, these were good to 4 GHz.