Renewals, buildouts and tower changes, flagged months ahead.

Put your licenses, and your customers', on a watch list by callsign or FRN, one at a time or imported straight from a spreadsheet. Sentinel RF checks every one against each weekly FCC data refresh.

Automatic expiration alerts at 180, 90, and 30 days out, delivered in the app and by email, the way a diligent office manager would catch them.

Construction notification deadlines sit right beside the renewal dates: the earliest unfiled deadline on each license, the days left, and alerts at 90 days, 30 days, and overdue. An unfiled buildout can cost the license, so it gets the same attention an expiration does.

Add a structure by its ASR number, or add your owner FRN and pick up every tower registered to you at once, with newly registered ones joining on their own. Name each site the way your crew does, not by its registration number.

Alerts when a watched structure changes owner, changes status, or changes height, and when an application is filed against its registration. That last one is the earliest warning there is, because a filing lands before the registration itself changes. It matters whether you own the tower and lease space out or just have gear on someone else's: a site going up for dismantlement is not something to learn from a field visit.

When a top light or flashing beacon fails on a registered tower, the owner has to report it and the FAA issues an obstruction NOTAM that carries the ASR number. Sentinel RF pulls the FAA's NOTAM feed every twenty minutes, matches it against your watched towers and areas, and alerts you when a NOTAM is issued, extended, cancelled, or expires. Where the FAA left the ASR number off, the tower is matched by its coordinates. For the operation that maintains the lighting, that is a service call within the hour instead of a compliance problem weeks later.

When a light fails, log it against the structure and the platform writes the report Flight Service asks for: ASR number, coordinates, height, the light that failed, the nearest airport and your return-to-service date. It tracks the 30-minute reporting window in 47 CFR 17.48, confirms from the FAA feed that the NOTAM actually appeared, reminds you before the NOTAM expires while the light is still out, and closes the record when the cancellation shows up. Every step is timestamped, so each structure carries its own compliance history.

Every license whose transmit site is that structure, listed against it. This is the FCC's own record of who is on the tower, not a guess from nearby coordinates, so it is worth trusting for a tenant audit or a co-location question.

Define an area and stay aware of new antenna-structure applications and grants inside it. A simple, weekly heads-up on what is being proposed or built nearby, useful for planning, coordination, and local awareness.

Set an area and a frequency band, and get notified when a new license is granted or applied for nearby: the coordination and interference check a system operator actually needs.

Define the area as a simple radius, a polygon you trace on the map, or a boundary you upload as GeoJSON or a shapefile, reprojected for you automatically.

Renewal windows, expirations, status changes, and new-activity alerts collect in one place, so nothing depends on one person remembering to check.