The HT-200 emits a direct uniform heat that radiates about 30 degrees (funnel type) all around the transmitter. Think of a flashlight that is pointed at the wall, the beam will be concentrated and dissipate around as we move away from it.
It is desirable to install the correct number of units based on 4 feet of radiation between each product to be cooked. As a result, you will minimize the number of units required for your specific needs.