A cooking unit includes a base pan, a can positioned on the base pan, and a cooking drum located on the base pan and within the can. The change-out flange is devised to replace standard hammer caps atop a well casing. The RSSI system is subjected to a narrow-band channel filtering having a band narrower than one-channel occupied band width) while the receptiondemodulation system is subjected to a wide-band channel filtering having a pass band equal to or wider than the one-channel occupied band width).