Hello,

thank you for starting this discussion.
I am in a similar situation. I am waiting for the QSX as my first rig (I am quite tempted to buy also the QCX+, even if I am not interested in morse code, just to learn stuff, but that's another story).

My constraints are:

- I live in an apartment (top floor). 

- I need to be discrete (no vertical antennas), but potentially (better to avoid but) I can try to spread an horizontal antenna (max 10meters long) outsides the windows of one of the sides of my flat.

- I have no good "ground" to connect to. I could use the building's mains ground, but I don't think that's a particular good one to connect to (?!?).

Given these constraints I have identified two interesting option:

1) A "portable/car" monoband antenna, like the Diamond HF20FX. It has good reviews (https://www.eham.net/reviews/view-product?id=8060) but I don't know if it needs a ground?!?

2) An half-wave horizontal dipole for max 20m (i.e., max 5m + 5m = 10m in total), to be placed horizontally. Is this a good idea? Can you suggest one?

I see the https://mfjenterprises.com/products/mfj-2220?_pos=3&_sid=bb33b0635&_ss=r , would that be good?

Thanks!