We have an AM transmitter about 5 miles from us (Westergren,
https://en.wikipedia.org/wiki/Wester...itting_station), but it does not cause too much problems on HF RXing unless directional antennas are pointed at it.
As I have said, I have another active antenna (copy of PA0RDT), and it works OK without overloading problem.
I will try to get a photo of the PCB inside the element, and upload here.
Looking at closely, the PCB does not have anything for RF gain control. It just have 2x transistors, capacitors and many resistors on the PCB.
To test the Bias-T, it was paired with the other active antenna, and it works OK.
But the element with the PCB, is clearly something not right.
Thanks for the contact info on Spectrum communication. I will try to troubleshoot as much as I can, but if fail to repair it or sort it, will contact them for the last resort
Thank you.