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Warning : If the antenna PCB ground surfaces are NOT connected to a noise free ground, but kept "floating", the on the coax outside induced noises will NOT be blocked by mantle current choke L6. You will experience an annoying high background noise level. DO GROUND THE ANTENNA PCB.

            The purpose of :
- antenna height is getting maximal useable signal strength
- the coax choke is to block noises coming from the coax outside
- the ground connection between the antenna PCB and a good grounded mast is : 
        To drain on the coax cable induces mantle currents directly to low-Z ground
- a buried coax is damping coax mantle currents and noises.

           The best solution :
        Install the antenna unit :
- as far as possible from noise sources
- as high as possible
- the mass plane of the antenna PCB directly connected (clamped) onto a noise-free grounded mast (NOT connected to mains-safety-"ground")
- if possible, burry the coax into the soil. This damps mantle current noises and is safer in case of a thunder storm.

       With the antenna unit on the house :
- install it as high and free as possible
- try to ground the mast. For instance connect it to the internal steel reinforcement of a concrete structure. .

        Important :
The antenna unit, nor the receiver shall receive noises which could be induced onto the outside if the coax screening..

            Therefore use: 
- ferrite clamps with LARGE holes, 
- wind THIN (1.6mm or 2.8mm) coax, or thin mains cable, as much times as possible LOSELY through it.

- over the mains cable near the receiver
- at the begin and end of the coax cable between the tuning unit and the receiver
- at the tuning unit over the coax running to the antenna
- over the antenna coax, at several places, divided over the full length

Remember : if the antenna unit is well grounded, the receiver may NOT be grounded to prevent ground loops.