9527169 Yes, by adopting a longer-range approach and utilizing the environment to optimize performance across more frequency bands, this is a more cost-effective solution. The overall noise level will remain relatively stable because your polarization method hasn't changed significantly. Generally, longer antennas tend to produce more noise, but this design doesn't extend to half a wavelength or similar, which would exacerbate the issue. The urban electromagnetic environment is complex, with signals from various directions. If you can raise the antenna higher, there might be some changes, but it's likely that the noise level will increase. However, the range of transmission could also potentially improve. In an urban setting, noise reduction isn't the primary concern; you shouldn't stop driving just because of traffic congestion.
Personally, I think a good area to focus on is grounding. Finding the true zero-potential point, cleaning up RF loops between power lines and cables, and properly managing RFI throughout the house. Then, experiment with this antenna for a while, especially for FT8, to see if you can establish weak signal communication and chase DXCC contacts. After some time, you'll be able to identify your antenna's blind spots, and then you can start thinking about new operating modes.
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