My experience is setting up improvised LZs is to simply activate one strobe (at night) to indicate the spot. If possible we had one person on the periphery with his arms straight out, back to the wind, which is really critical to the pilot. In daylight, we would pop smoke.

On one occasion we had to improvise with a bonfire - fortunately it was a hoist operation. None of the pilots in post operation critiques ever mentioned the need for more indicators.
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Geezer in Chief