An antenna allows the communication with Kerbin, when deployed. With version 0.22 the antennae allow transmitting back scientific data without the need to recover the craft on Kerbin. Mods like the RemoteTech add additionally functionality to them.
When it transmits data to the Research and Development facility, it consumes quite an amount of electric charge. The transmission will be suspended when all electric charge is drained, but continue automatically after sufficient power is available. The antenna will also automatically deploy to perform the transmission and retract after completion. Aborting the transmission of scientific data will destroy the data which was to be send. No warning is given about this. In case no specific antenna is selected to send the scientific data, the game chooses the best one. Any antenna will send the data in packages of 2Mits. The cost differs from antenna to antenna.
Prior to version 0.22 antennae can't be retracted. Though there was a bug when the craft is accessed from the Tracking Station, will make the antenna blocked in the retracted state.
|Image||Part||Radial size|| Cost
| Net transmission speed
|Relay capable||CommNet Tier|
|Communotron 16||Tiny||300||0.005||2 000||7||50||6||20.0||3.33||No||1|
|Communotron 16-S||Radial mounted||300||0.015||2 000||7||50||6||20.0||3.33||No||1|
|Communotron DTS-M1||Radial mounted||900||0.05||2 000||8||50||6||34.3||5.71||No||3|
|Communotron HG-55||Radial mounted||1200||0.075||2 000||7||50||6.67||133.3||20.0||No||4|
|Communotron 88-88||Tiny||1 500||0.1||2 000||7||50||10||200.0||20.0||No||5|
|HG-5 High Gain Antenna||Tiny||600||0.07||2 000||8||50||9||51.4||5.71||Yes||2|
|RA-2 Relay Antenna||Tiny||1 800||0.15||2 000||8||50||24||68.6||2.86||Yes||3|
|RA-15 Relay Antenna||Tiny||2 400||0.3||2 000||8||50||12||68.6||5.71||Yes||4|
|RA-100 Relay Antenna||Small||3 000||0.65||2 000||8||50||6||68.6||11.43||Yes||5|