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I've got an old HP desktop machine that I want to connect to my old HP w2338 monitor in a wireless fashion. How can I do this?

My GPU is an Nvidia Geforce 210 from PNY.

The reason why is that I want move the HP tower down onto the floor to clear up desk space but my current HDMI cable is not long enough to connect to the monitor if I do that.

You won't be able to cheaply. For something like $4 you can get a 6' HDMI cable from monoprice.com. That'd be the betters solution.

It would be far easier, simpler, higher quality and cheaper to get a longer HDMI cable.

The reason for this is that wireless display technologies have all sorts of compromises. First off, you'd need a wireless transmitter as well as a receiver for the monitor. The receiver will need to plug into the HDMI port on the monitor. Then be prepared to a reduction in picture quality if you get a picture at all. The 2.4 Ghz and 5 Ghz wireless display technologies don't have enough bandwidth to transmit a 1080p@60 Hz so compression is involved. The 2.4 Ghz spectrum is unregulated so expect plenty of dropped packets if you live in a suburban or urban environment. Things are a bit better with 5 Ghz display adapters as it is reserved for wi-fi and similar technologies in the US. Wireless displays using 5 Ghz are designed to work with wi-fi networks but this could still mean a reduction in usable bandwdith and force the transmitter to use a more aggressive compression algorithm. Then there are a few 60 Ghz wireless display adapters. The 60 Ghz spectrum is relatively open but it has its own unique compromise: it requires line of sight of work. Anything thicker and/or more dense than a cardboard box can block a 60 Ghz signal.