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Originally Posted by budkor22
For earth connection, what about earth post at the back of the HF rig and also at the back of ATU, do they all need to get connected to outside earth connection?
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You need to be careful about bringing an external earth into the house. There is an RSGB booklet about this, which basically says don't do it but if you must do it get it checked by a qualified electrician.
For an antenna which needs an earth connection you may need rather more than a spike in the ground. You either need radials, or a different antenna type which does not require an earth connection (e.g. some form of dipole/doublet).
A twin balanced feeder does not radiate (provided there is no common-mode current) because it is balanced and has close spacing. You can ensure no common-mode current by using a choke 'balun', although in many cases you can get away without one.