Long range wireless video transmission

Hello,
We are looking for small, light weight, long range wireless video transmitters and receivers. Intendent applications are from blimp,
kite, model aircraft (UAV), high altitude baloon to ground live video transmission.
We are happy to use high gain, diretional antennas on the ground (receiver site), but we can not use large antenas on the transmitter site due to the type of intendent platforms.
We are only interested in transmission ranges not less than 5km.
Do you know any product close to above specs?
Thx.
miemchan at gmail com
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