I'm trying to study deeper- and even try!
- the receiving loop antennas for low bands. All of them requires low noise amplifiers.
All recommendations that I found on the web are for such LNA's placed close to the transceiver. It means matching balun between the loop and feed line (coax or twisted pair) running down, then struggling with common mode noise on the feed line and after that- amplification of signals +noise by LNA.
The question: did anyone try to place the differential (operational) amplifier at the antenna side, eliminating the need of balun and not amplifying the unwanted noise? Something similar to ADA4899-1 or AD8432?
I received this advice from antenna pro and wonder why this solution is not popular despite it sounds very logical.
73! Ilya 4Z1UF