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Need advice if SDR is right for me?


Mai
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Hi Gang,
1st Post. Total newbie.
I want to buy a HackOne RF kit or similar, but not sure if it's the right tool for my application, or can I buy something cheaper?
I am building a Sensor station that has pretty much every sensor there is. If it's a module from AliExpress, or designs found in magazines and DIY online articles, it has it.
It uses an ESP32 as the main MCU, and it can measure and log temperature, humidity, UV, IR, Visible,... too many to list.
Now I want to get into the radio part, and add radio interrogation of the surrounding.
My summer cottage, where this installation will be taking place, is on a hill top and I have 360 view for miles.
I've seen some strange light dancing in the sky, as in UFOs, and I want to see if they transmit any radio waves I can detect and record. Is that even possible?
Basically, I want to be able to triangulate a source of radio emission, if any new source shows up. If they've been there before, skip them. Only new signals. 
Since the scan window on these units are narrow, can I scan the entire range of say 300Mhz to 3GHz using a computer and script? There is a program called "RTLSDR Scanner", but not sure how fast it can pick out a new signal in such a broad band. How fast can I scan this entire windows? Would having multiple units aid in faster scans?
Also, when I was a kid, we had a car with an electric antenna. It completely hid itself into the body panel, when brought down with a switch on the driver's side.
However, you could adjust how much the antenna came out, by switching it off or on at the right time.
Can I use a similar principle, to control the length of the antenna for transmission or reception, which would match the signal's frequency, instead of using an antenna multiplexer, and having 8 separate antennas?
My long term project goal, is to add stereoscopic HD cameras to my 5" Newtonian telescope, which is in the process of being retrofitted with geared stepper motors to allow pan and tilt. These two cameras, along with a 360º sky camera, will decide where the telescope should point, and track the object using an Nvidia Jetson Nano and machine vision code and tensor flow. (Google "nvidia JetPack").
Sorry for so many questions and such a long post. I am learning this stuff for the first time and its tough to not get drowned under information overload.
I am open to any suggestions you may have.
Thanks to all in advance.
Cheers,
Mai

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