$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install Realtek RTL-SDR Driver on RHEL-based Distros

GNU/Linux RHEL-based Realtek RTL-SDR Driver Setup Guide

How to Install Realtek RTL-SDR Wireless Driver on RHEL-based GNU/Linux desktops – Step by step Tutorials.

And RTL-SDR (RTL2832U) is a very cheap USB Dongle that can be used as a Computer based Radio Scanner for receiving Live Radio Signals in your Area (no internet required).

Finally, depending on the particular Model it could receive frequencies from 500 kHz up to 1.75 GHz.

How to Install Realtek RTL-SDR Driver on CentOS - Featured

GNU/Linux RHEL-based Realtek RTL2832U RTL-SDR Driver Installation Guide