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Worked DXCCs:

Equipment

Transceiver HF:
• Yaesu FTDX5000MP

Microphone:
• Heil Pro Set Elite 6 (HC-6 element)

ANTENNAS - rooftop of a 17-storey building:

• Custom OCFD 160-10m - feedpoint at 16.7% (1/6) of the wire
    ◦ Total Length: 83.5 meters of P-268 (П-268) military field wire
    ◦ Feedpoint Height: ~61 meters AGL (roof-mounted mast)
    ◦ Geometry & Orientation: Sloping configuration, axis roughly NW to SE (Long leg azimuth: 305°, Short leg bent to 130° due to limited roof space)
    ◦ Matching & Choking System:
        ▪ Feedpoint: 4:1 Guanella Balun (2x Amidon FT-240-43) + 1:1 Common Mode Choke (2x Amidon FT-240-31)
        ▪ Shack End: Second 1:1 Common Mode Choke (2x Amidon FT-240-31) directly at the transceiver to decouple the 50m cable duct run and block building QRM (including elevator noise)
    ◦ Feedline: Low-loss Radiolab 8D-FB coaxial cable

• Custom 10m Monoband 5el Yagi (OWA Design)
    ◦ Boom & Elements: 5 elements on a 9-meter boom (~0.85λ), OWA (Optimized Wideband Antenna) design for high F/B ratio (>22 dB) and clean pattern
    ◦ Height & Clearance: ~61 meters AGL on a 10m roof-mounted mast (~5.8λ height above ground)
    ◦ Takeoff Angle (flat-earth model): Main lobe ~2.5°, then 7.4° and 12.4°; nulls ~4.9° and 9.9°. The very high mounting gives a low first lobe, well suited to multi-hop F2 DX paths
    ◦ Orientation & Target: Fixed azimuth 128° (SE), aligned directly toward Oceania, VK/ZL, and South-East Asia

Other stuff:
• Yaesu SCU-17 USB Control Unit / Audio Interface