My set up.
1) DJI Phantom 2 with Zenmuse H3-3D 3-Axis Gimbal and GoPro.
2) Immersion RC 600mw 5.8 GHz A/V Transmitter with a 5.8GHz Fatshark spiroNET Antenna attached
3) RX-LCD5802 5.8GHz 7" LCD Diversity Receiver Monitor with a 5.8GHz Fatshark spiroNET Antenna.

I get interference lines and static on the monitor, even when the Phantom is only a few yards away.
When I wrap my hand around spiroNET Antenna, the interference lines goes away.

Any clues?

-- I removed the monitor from the controller and put it on a tripod and the interference disappeared.

I found the interference lines and static was being caused by the DJI controller antenna.
I shielded the monitors antenna with a piece of heavy aluminum foil between the controller and the monitors antennas interference disappeared.