Interesting concept, but I wonder about the economics.

A telephone pole has a volume of about 3 million cubic centimetres. Tungsten's density is ~20 g/cm^3, so we're talking about 60 000 kilograms of tungsten. At around $40/kg, that's ~2.5 million dollars per rod just in raw materials.

But that's ignoring the cost of bringing a 60 metric ton rod into orbit, of course. You'd need a Falcon Heavy launch per rod, ignoring the problematic dimensions (let's assume you can cold weld a few pieces together in space). That's at least another $60 million per rod for the launch costs.

60t of lead, on the other hand, will go for a mere 120k USD, at about double the volume. Not sure if the effect will be the same (it certainly sounds like a good way to poison vast swathes of land).

Just toss some "small" asteroids down then. (More an issue once we get to the point of interplanetary war, but still cheaper than manufacturing pure tungsten rods).