Thanks for your input uGlay.
If you are designing for a new installation, ongoing airworthiness requirements should include a visual inspection of the antenna periodically. You may wish to specify the suggested remedy in case cracks start to appear around the window but ideally you should seek...
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On certain aircraft, the DMNI-70 and DMNI-50 L-Band (ATC/DME) Antenna exhibit corrosion on the blade, moreso the top than the bottom on propjets. This is usually first noticeable as a small amount of blistering under the original paint.
Closer visual inspection can sometimes reveal...