General Question about Powershell and Wireless

Since I don't test anything at home, is it our network at work or does powershell not work over wireless.  Even if I run a simple command say

Get-WmiObject Win32_LogicalDisk -ComputerName $computer -Filter "DeviceID='C:'" | Foreach-Object { "{0:n2}" -f ($_.FreeSpace/1GB) + " Gigabytes" }

on a wireless connected computer, no dice.  Wired = good.