Long-Wire across tile roof.
A long-wire antenna on a tile roof can work, but its performance depends on a few factors:
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Roof Material: If the tiles are made of concrete or ceramic without metal underlayment, they won’t significantly affect the antenna’s performance. However, a metal radiant barrier or foil insulation under the tiles could detune the antenna or reduce its effectiveness.
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Height and Length: The higher and longer the wire, the better for long-distance (DX) communication. Performance will likely improve if you can get the wire a few feet above the roof (using standoffs or insulators).
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Grounding and Matching: A long-wire antenna needs a solid ground system or counterpoise. An antenna tuner will help match it to your transmitter, especially if operating across multiple bands.
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RFI and Noise: Being close to the house may increase noise from electronic devices. Using a common-mode choke on your feedline can help. Vertical Antennas are more susceptible to noise than horizontal ones.