Hi does the ethernet port speed support gb?

No it does not. The ethernet is 10/100 - does not support Gigabit speed. I recently replaced a Roku Ultra which was having a great deal of trouble with 4k Ultra HD content due to the Ethernet port being only 10/100. While a 4k stream should not require more than 100mbit on its own, my home network has almost 30 devices on it. The Roku was one of the only media devices with 10/100. When bandwidth is being apportioned from the router, it is not enough (due to overhead). Replaced it with a Shield TV Pro and so far, everything is working. If this unit had come with a Gigabit port, I would be ordering one right now.

Will this device allow me to watch OTA channels?

It will not let you watch OTA channels natively, however you have a couple of options (without subscriptions to streaming). First, if you can get your hands on the Fire TV recast (Discontinued by Amazon) it'll connect with little effort. Second, and better is by buying a Tablo DVR. There are a couple of options from them. Some of their OTA DVRs have an HDMI output you can connect and watch through the Cubes HDMI input or a network DVR, like this one that works fine with all Fire TV devices https://www.amazon.com/Tablo-Quad-OTA-Cord-Cutters/dp/B07PLVF8B7/ref=mp_s_a_1_4?crid=1P9BZHEYMGA6T&keywords=tablo&qid=1669584572&sprefix=tablo%2Caps%2C99&sr=8-4&ufe=app_do%3Aamzn1.fos.08f69ac3-fd3d-4b88-bca2-8997e41410bb

Will it support a Plex Server?

It could probably run a plex server. But Plex would have to create server software specifically for it. Or you would have to find someone who has side loaded it to show you how. Plex Server and Plex Client are two different things. I use an Intel NUC with an Intel i5 processor using USB 3.0 External HDDs for files. Its been great for low power always on Plex server. Assuming you are looking for a low power option. It idles at 5W and underload uses at most 25W.

What's a compatible usb storage adapter and maximum memory to buy?

I am using the "Anker 2-in-1 USB 3.0 SD Card Reader", Model 68ANREADER-B2A with a 128gb SD card, but I do not know the max size. They do support NTFS which should support lager sizes, but I have not seen anything in the user guide. Previous cubes maxed out at 128k! It also appears it will not recognize 2 sd cards simultaneously!

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Specifications

Size	3.38” x 3.38” x 2.99” (86 mm x 86 mm x 77 mm)
Weight	513g (1.13 lbs)
Processor	Octa-core 4x 2.2GHz 4x 2.0GHz
GPU	800MHz
Storage	16 GB internal
Memory	2 GB internal
Wifi	Wi-Fi 6E Tri-band. Also supports 802.11a/b/g/n/ac/ax wifi networks. For Wi-Fi 6E support, Fire TV Cube must be connected to the 6 GHz band of a Wi-Fi 6E network using WPA3 encryption.
Bluetooth	Bluetooth 5.0 + LE. Pair with compatible Bluetooth speakers, headphones, video game controllers, and more.
Voice support	Far-field and near-field voice support
Voice control compatibility	Controls a wide range of IR-enabled devices, including TVs, soundbars, cable and satellite boxes, and A/V receivers.
Cloud storage	Free cloud storage for digital content purchased from Amazon.
Ports	HDMI 2.1 Input, HDMI 2.1 Output, IR Extender, Power, USB-A 2.0, Ethernet port 10/100Mbps
Audio support	Dolby Atmos, 7.1 surround sound, 2-channel stereo, and HDMI audio pass through up to 5.1.
4K Support	To watch movies and TV shows in 4K Ultra HD, you need a compatible 4K Ultra HD TV. All services may not be available in 4K/HDR. Certain services are subject to change at any time, may not be available in all areas, or in 4K/HDR, and may require separate subscriptions. Learn more about services.
Content formats supported	Video: Dolby Vision, HDR 10, HDR10+, HLG, H.265, H.264, VP9, AV1, Audio: AAC-LC, AC3, eAC3 (Dolby Digital Plus), FLAC, MP3, PCM/Wave, Vorbis, Dolby Atmos (EC3_JOC), Dolby MAT, Dolby TrueHD passthrough, DTS passthrough, DTS-HD passthrough (basic profile), Photo: JPEG, PNG, GIF, BMP
Output/Input resolution supported	2160p, 1080p and 720p up to 60 fps
System requirements	High-definition television with available high-speed HDMI input, high-speed internet connection via wifi or built-in Ethernet port, power outlet (compatible TV/sound/cable equipment for control by infrared or voice). High-speed HDMI cable rated 18Gbps or higher, and 4K TV with high-speed HDMI connector required for 4K viewing and more reliable device control. Wi-Fi 6E router needed for Wi-Fi 6E support. Auto-Low Latency Mode is included in the HDMI 2.1 standard.
TV compatibility	TV must support minimum HDCP requirements for protected content playback. Compatible with 1) 4K ultra high-definition TVs with HDMI capable of 2160p at 24/25/30/50/60 Hz and HDCP 2.2 or 2) high-definition TVs with HDMI capable of 1080p or 720p at 50/60 Hz. Learn more about high-definition.
Warranty and service	1-year limited warranty and service included. Optional 2-year and 3-year extended warranty available for U.S. customers sold separately. Use of Fire TV is subject to the terms found here.
Content availability	Certain apps and services are subject to change or withdrawal at any time, may not be available in all areas and languages, and may require separate subscriptions.
Accessibility features	VoiceView screen reader enables access to the vast majority of Fire TV features for users who are blind or visually impaired. Screen magnifier enables viewers to zoom in and out, and pan around the screen. Text Banner consolidates onscreen text into a compact, customizable banner that appears on the screen. Watch videos and TV shows with closed captioning displayed. Use Audio Description for verbal descriptions of what is happening on the screen, including physical actions, facial expressions and scene changes. Captions and audio descriptions are not available for all content. Fire TV Cube (2nd and 3rd Gen) supports audio streaming for select compatible Bluetooth hearing aids for a private listening experience. You can also listen to Fire TV with compatible Bluetooth headphones. Learn more about accessibility for Fire TV.
Included in the box	Fire TV Cube (3rd Gen), Alexa Voice Remote Enhanced, power adapter, 2 AAA batteries, Quick Start Guide. HDMI, IR extender and Ethernet cables are sold separately.
Software Security Updates	This device receives guaranteed software security updates until at least four years after the device is last available for purchase as a new unit on our websites. Learn more about these software security updates. If you already own a Fire TV, visit Manage Your Content and Devices for information specific to your device.
Size	38 mm x 158 mm x 17 mm
Weight	51 g (without batteries)
Batteries	2 AAA (included)
Technology	Bluetooth 5.0
Compatibility	Fire TV Cube (3rd Gen), Fire TV 4-Series, Fire TV Omni QLED Series

Fire TV Cube with Alexa Voice Remote Pro

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