An instrument landing system comprises: a wideband antenna configured to receive signals in a VHF band; and a receiver coupled to the wideband antenna and configured to implement SDR functions to analyze the signals for a flight inspection. A UAS comprises: an instrument landing system comprising: a wideband antenna configured to receive signals in a VHF band; and a receiver coupled to the wideband antenna and configured to implement SDR functions to analyze the signals for a flight inspection. A method comprises: receiving, using a wideband antenna, signals in a VHF band; and implementing, using a receiver coupled to the wideband antenna, SDR functions to analyze the signals for a flight inspection.