Reference for Shabbat 309:2

טעמא דנעץ יתד באילן הא לא נעץ אפילו למטה מי' טפחים אין עירובו עירוב והא האי תנא דקאסר בצדדין וקשרי בצדי צדדין

above ten handbreadths [from the ground], his 'erub is not an 'erub;<span class="x" onmousemove="('comment',' Because a basket is generally four handbreadths square, and if it is ten from the ground it is technically a private domain (cf. supra 6a), whereas the ground below is a public domain, and so one must not take the 'erub from the basket; hence it is not accessible. ');">²</span>

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