If you don't have a remote sensor, you can still do packet captures on one or more channels using external USB Wi-Fi adapters. However, because we can't use external adapters natively as we do with the Mac's built-in Wi-Fi adapter, we need EASE (External Adapter Support Environment).
You can capture packet traces from your iPhone, iPad, or iPod touch using Airtool 2. A packet trace capture from an iOS device records traffic at the network layer [...]
The WLAN Pi is a device designed for assessing, testing, and troubleshooting Wi-Fi networks. It's a small computer based on the NanoPi Neo2 board that is pre-loaded with a [...]
Apple’s AirPort Utility for iOS includes a Wi-Fi scanner you can use to scan for nearby networks from your iPhone or iPad. Scan results are presented as a list [...]