Update:
Added Chebyshev 3-8 MHz 3rd Order BPF, and also replaced the 1uF input caps by 100nF ones as they resulted in a flatter response between 3-4MHz and improved MF rejection.
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Also performed some tests with a small input transformer (4:1) connected to an "ugly loop" made from a 4m segment of RG11 coax.
Reception was crappy, as The loop was resting partially on the floor and close to AC wiring, but it was enough to confirm that the signal pickup increased some 10 dB with that transformer.
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I have to try a better loop on the roof, far from my lab, power supplies, etc.
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One thing I noticed is how strong the signal level from the LZ1AQ preamp is. I had to turn the attenuator on, as the noise floor of the preamp alone was aronund S5 and rised to S9 with the loop connected.
Caaarlo