Exact(2)
The LFR required a complex ground installation (four to five antenna towers per station) and careful monitoring of its signals, producing directional radio waves which defined flyable airways, with only a simple AM receiver needed on board the aircraft.
The LFR navigation system required, at a minimum, only a simple AM radio receiver on board the aircraft to accurately navigate the airways under instrument meteorological conditions, and even execute an instrument approach to low minimums.
Similar(56)
A simple "were" before "asked" would have fixed this.
To critics, a simple is missing would solve the problem.
A simple is an entity that has no proper parts.
A simple example is education.
A simple solution is guns".
A "simple apology" was more important.
But what will a simple "journeyman" be?
But a simple ratio is illuminating.
"A simple mistake was made," he said.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com