I live in 3rd-floor urban flat. If you hear me, it's probably thanks to my Hustler mobile antenna. It's clamped to the aluminum rail of my balcony, which appears to be bonded to the metal siding of the building. When I discovered that, I made the rail my station RF ground. My noise level dropped dramatically!! and this has made ham radio interesting again. No longer was I confined to mobile operation.
The Hustler has gained me WSPR reports on 10, 15, 20 and 40m, and I have worked 5 continents on CW and SSB. I have used it to pick up over 150 LF/MF aircraft beacons from Hawaii to Hudson Bay. For LF/MF I work it as a voltage probe, with a homebrew FET preamp. (Attempts to base-load the Hustler have not succeeded.) My best LF/MF DX is hearing WG2XXM at 2500 km on 600m. I was able to complete two seasons of LF/MF activity before it was curtailed by a dramatic rise in impulse QRN from a cycling source (possible aquarium heater or electric blanket?).
I still get TVI complaints, so to keep peace with my neighbors, I have adopted QRP/QRPp modes like JT65 and WSPR, as well as SWL work. My IC-735 is capable of 100W but I am using the transverter output at -13 dBm, buffered to +13 dBm with three Motorola MWA hybrid amplifiers. The antenna relay from an old Motorola Mitrek mobile radio serves as a T/R relay. At that level I can WSPR all I want (though I don't actually transmit 24/7).
The Hustler is being used with the low-Q version of the 15, 20 and 40m resonator coils. On 10m it will resonate without a coil when extended with a surplus Larson VHF mobile whip. On 30m I am using the 20m coil, but with the Larson whip inserted in place of the 20m whip provided with the coil. ERP on 30m is probably under +5 dBm owing to coil loss, mismatch etc. On 80m, my ERP would be so small I haven't bothered trying, and anyway the IC-735 output is not very clean there. I have not been able to work any CW QSOs with the WSPR transmitter -- just too weak I guess.