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A new book from the ARRL may be the reference you need if challenged by your HOA:

No Outdoor Antenna? No Problem!

Don’t let outdoor antenna limitations keep you from enjoying amateur radio. It is possible to operate on the HF bands with equipment and antenna systems that are entirely inside your house, apartment, or condominium. All it takes is some creative thinking!

Ham Radio from Indoors shows you how to install an effective station and indoor antenna system in any setting – even your living room. Get the most out of your indoor station by exploring different operating styles such as CW and popular HF digital modes for low power. This book includes indoor antenna solutions like simple wire designs for an attic, or a loop that fits neatly on a tripod. Ham Radio from Indoors offers advice to help you cure interference problems, as well as a detailed discussion of RF safety.

The Indoor Challenge

• Optimize Your Operating
• CW—Even If You Don’t “Do” CW
• The Digital Alternative
• The “WSJT Modes:” FT8 and FT4

Indoor Antenna Designs

• Commercial Antennas Indoors
• Into the Attic

Dealing with Interference

• Identifying the Type of RFI Source
• Identifying Noise from Part 15 Devices
• Locating Sources of RFI
• Noise Sources Inside Your Home
• Noise Sources Outside Your Home
• Interference Fixes

RF Safety

• How Electromagnetic Fields Affect Us
• Thermal Effects of RF Energy
• The Revised RF Exposure Rules that Took Effect in 2023

Appendix — A Collection of Indoor Antenna Articles
A 10 Band “Stealth” Attic Antenna System for Contesting and DXing
160-Meter Window Line Loop
A Simple and Effective 10 Meter Radiator
Inexpensive Indoor HF Antenna for Apartments