Does anyone know if it is possible to use a very small omnidirectional antenna, specifically the telescopic antenna apart of this Nooelec SDR bundle? I haven’t really seen anyone else use one and I’m hoping to just place one of them in an outdoor enclosure plus all the other electronics.
Hello, I’ve seen that there’s a station on here that was using one and was getting pretty good signals. I’m not sure of the station number so I can’t direct you to it but they put a small antenna like that on a patio table and it works. The station had its antennas in the picture on the bio of the station, only way I know about the antenna used. Worth trying 
… Wait… Googled it and found it 
https://network.satnogs.org/stations/704/
Great, it looks like they have alot of successful observations. It looks like his antenna is wide open whereas I was planning to keep the SDR+LNA atatched to antenna within the enclosure. I’m not sure whether it would block the signal or if it wouldn’t even be necessary.
Here is the list of items i’m planning to get from Amazon. (I already have a Raspberry Pi and power supply)
generally speaking, keep the antenna and lna far away from all other electronics, including network.
use a proper ground plane connected to the end of the coax shield, or a metal table as in station 704 (:
you can have a coax length with a loss less than the lna gain basically.
another pretty good antenna is the patch, as in station 6.
a lot of simple semi directional antennas pointing straight up can also be used.
The cable is only 60cm. Would that be enough or should I get some additional length?
the cable/connector on the antenna should be connected directly to the lna, the shorter the better.
between the antenna+lna and the sdr+host+network you can have a section of coax, under normal conditions the loss in the cable is compensated for by the lna, but only if the lna is close to the antenna. a lna cannot do magic, any signal lost is just gone.
Ok then. What do you think would be optimal distance for keeping the antenna away from as much interference without also having significant signal loss?
depends on cable and connectors, 10m rg58 with sma connectors would be something like 4-5dB on 450MHz. well below the 20dB gain that the LaNa has at that frequency.
You can start with a very simple antenna, because it is better to be online with something than nothing 
But I would recommend to build a very simple Yagi antenna, like this one:
https://www.larsthunberg.se/2023/08/03/diy-5-element-uhf-yagi-of-dk7zb-model/
Good luck!