I was following this guide to setup an iGate using an RTL-SDR dongle and a Raspberry Pi. It worked, and I have been able to test it by seeing some APRS packets from a separate transmitter (Arduino+BaoFeng HT) I made be relayed through that IGate. However, when I moved the IGate to another room in my house, there was a significant decrease in the number of packets that were successfully received by the IGate. I am thinking that I should put a better antenna on the dongle. Currently the antenna I have on the IGate is some 4 inch rubber ducky antenna that I scavenged from an old 2G/3G cellular modem.
Can you suggest what criteria I should use when shopping for a better antenna for the IGate?
I am in the USA and so use frequency 144.390 MHz.