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The main receiver can be programmed to pass on "returns" from one particular region while eliminating most of the other returns as unwanted noise or clutter. Furthermore, the ROTHR system has its own built-in automatic management & assessment function and does not have to depend on external sounding data.
Because HF frequencies were being used the power was kept very low to minimize interference to other services during the early tests. At the time of writing it is believed that a full-power relocatable OTHR system situated in Virginia is being used in the anti-drug war. As can be seen from the map this ROTHR can cover a vast area of 1.6 million nautical miles, straddling the whole Caribbean.
Each one of the 176 DIRs can be "illuminated" for only a few seconds at a time. Small aircraft and small vessels can be detected by an ingenious method, only when they move. This is how it is done: At the receiving site of the ROTHR system a very large antenna stretches out over a distance of 8,400 feet.
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