I recently moved to a Arizona HOA - Before I lived in NH & MI - lots of room for full size antennas - and had many.
We have a back yard with a 6-7ft block wall around it.
I took a 20m MFJ hamstick & mounted it on Bucket filled with 25lbs of cement & wood to attach to.
The base of the antenna is 2ft off the ground with a single 1/4wave counterpoise wire also 2ft off the ground held on end by camera tripod.
Made one for 10m & 20M in single bucket - see pic on ORZ on right ( click on, gets bigger) - my call K1WJ. Check it out.
Both have at least 100khz of bandwidth - low cost - low visability - Simple.
Have made Hundreds of contacts on 10m/20m with these low profile antennas - Band conditions dictate success primarily.
See other antennas like the Transworld 2010 or whatever - costing like $300 - My 10m/20m 2 antenna system cost about - $70.
I was in the back yard looking at antennas the other day - & said to myself " wow I worked Japan & Russia last Saturday on that, amazing"
Was worried about HOA - Not any longer - make contacts - Everyday. 73 K1WJ David