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Possibly
You would have to do a link budget analysis for a specific example and include Tx power Tx gain, Rx gain, reciever sensitivity, noise figure and free space path loss.
If the Tx power and antenna gains are sufficient to support your Rx sensitivity, NF requirements over your required...
Maybe you are talking about the difference between Gain and Realized Gain which is proportional to (1-|S11|^2)
I.e. a -4dB S11 >> ~ 0.7dB drop in 'realizable' gain.
The match cannot be thought of as a simple 'attenuator' of power. It is integral to the transforming nature of the antenna...
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