Sense Sonnet - Chiller

We sent some scouts to check it out,
A planet - third rock from a sun.
Found some weird creatures all about.
Each called itself a human one.
The scouts went where few humans were,
And installed the homing hardware.
We have locked in signals secure,
And concluded we can thrive there.
A few humans have found the tech,
Call it a picket fence made by
Some new bug - oh what the heck!
Humans will find out too late why.

The scout signals are right on tune.
Aliens, and we're coming soon.