I was living in a flat, and wanted to put up an aerial, I found a length of 300Ω ribbon cable cut to form a slim jim and stuck to the window with sellotape was good enough to reach local repeater and play packet radio with 5 watt transmit power. (VR2ZEP)
OK there were 40 floors and I was on the 35th, so no way I could have run a cable to roof, and at that height good take off.
But some times we over think what is required, last house aerial was around 10 foot high on side of garage, it actually worked better low down, as line of sight to Moel-y-parc, but house shielded it from Winter Hill, so it stopped the TV trying to continually re-tune its self.
And on the Falklands I found myself living in a container, a really good faraday cage, and I was using a single long wire, all theory said it should not have worked, but I was talking to locals some 20 miles away without a problem. (VP8BKM)
In other words, suck it and see.