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can we use DRO without enclosure? (in self-mixing AIA antenna)

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Hello! Usually DR oscillators are put in enclosures. Can we guarantee frequency operation stay in range of about 100 MHz if we do not use enclosure? For example, in active integrated antenna (AIA), where oscillator itself is an radiating antenna without enclosure. In many AIA antenna used as resonator, so there is no any enclosure. What if we add DRO in that configuration?
 

as long as you can make it rugged to withstand shock and vibration, temperature drift or thermal gradients and stray leakage and effects on tuning... phase noise, frequency drift often require rugged protection, so it depends on test results with your design specs.

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I might suggest a folded tinned steel shield on the board for protection.
 
leakage used as LO for oscillation. I do not want steel enclosure, i want DRO radiation go freely in outer space
 

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