For exposing localhost NodeJS and Apache we use free tool Localtunnel, in below video you can see our local host in apache server php and node js is easy expose to to global internet.This method also work for Tomcat Java Server too.

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When in past i worked with SDR hardware i experimental that noise line in space is about -100dB, when i don’t amplify RF gain, when i amplify it, it is -80dB till -20dB. So other hand when i use different antenna pick value of noise is change, today i know that a antenna is a dipole network that can describe with scattering matrix.

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