WiFi Explorer Vr 1.7.2(6) lost sensitivity on my 2012 Mac Pro

When running WiFi Explorer on my 2012 Mac Pro, I can see my 4 networks and occasionally one or two in my nieghborhood
But if I run the same App on my 27 inch iMac sitting nest to the Pro, I can "see" 12 or more networks.
Am wondering if I may have a weak wireless board in the Pro?
Or, could it be the metal cabinet that is hindering wireless signal.
The Pro works just fine on my own network..
Is there a test method I can use to check the internal wireless card on the Pro?

The metal chassis of the Mac Pro does attenuate the signal somewhat. Its reception will typically be adequate, but perhaps not quite as good as another model Mac that is intended to be used mostly wireless, such as a MacBook Pro. At 42 lbs, the Mac Pro is far from portable, and has been optimized for use with Gigabit Ethernet.
One possible problem that is occasionally encountered on any Mac is a disconnected antenna wire. In this case, the performance typically drops so low that the machine is unusable. [Conversely, if your is usable, it is unlikely to have this problem.]
There is a Wireless Diagnostic available in 10.7 and later. Hold down the Option key while you click on the Wi-Fi icon in the menuBar, and a display like this one will appear. Note the last few items in the menu item include invoking the diagnostic.

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