Request for Recommendation - Wireless Device for monitoring remote wireless coverage, Ping & Latency, and maybe spectrum analysis?

Hey everyone, I think this is the right place to come. I'm looking for some sort of recommendation, or even a direction to be pointed. We have a need at our company to have the ability to monitor some criteria as a wireless client in a remote location (just not in our corporate office). Here's what i mean - We use a monitoring service called What'sUpGold that does a great job, but that's from the perspective of a server which can monitoring wireless access points, or even end devices.

Lately we've been getting reports of some "bad wireless", but upon inspection we don't see any sort of poor coverage or any sort of slowness in the reported areas. The frequency that we are being brought into the conversation is enough to have me looking for something that can just stay over in that reported area. So what I'm hoping for is a small device that can just stay in the reported area and collect data for us such as ping history to a custom IP, latency to specific sites or servers, RSSI history in that location, and even any sort of spectrum analysis.

I found this company NetBeez that does almost exactly what I'm looking for, but their pricing is just absurd. For an on-prem virtual appliance, and 5 wireless devices (that you lease, not own) is up over 5k a year. Does anyone here have any other ideas besides throwing some sort of monitoring freeware on laptops and putting them around campus?

Thanks everyone!