You've been on the site over 3 years. In that time, you've made 915 posts. I joined in 2005 and this is my 1100th post. I would hope that you have gotten to a point of more than "beginner" with the interactions and knowledge that has been shared with you.
You are not in the US. Most people that are offering you advice are.
You are always very unwilling to share your information. You have made references to the monitoring you wish to do being illegal in your country. If it's illegal, perhaps you shouldn't be doing it.
If someone offers a solution/answer to you and it doesn't meet your exact
need (which you tended to be vague on,) you answer in a short and impolite manner. Many people find this offputting.
A simple question has been asked. What is the frequency or frequency range that you are getting the unwanted interference on, and what frequency or frequency range is the interference coming from. The answers should be in numbers, not words.