standoff transmitter

Hi:
what is the meant by this statement
using a standoff transmitter and a penetrating aircraft with a silient receiver
thanks

Can you give the complete paragraph otherwise it is like poetry for us.

Just quote in Google your full sentence and you get the file on the book “Bistatic Radar” by N.Willis, and the explanation to your question.

It is one of the technique in sniper mode.

If an aircraft is approaching the hostile range. Hostile defense systems can detect the signals coming from the aircraft radar, assumed aircraft is operating in tx and rx modes.
if the aircraft is not operating tx mode but only Rx mode. this case Tx is supported by the standoff transmitter present either in air or land.
"penetrating aircraft with a silient receiver" means aircraft approaching hostile environment silently.