Thanks for your reply, that's a fair comment, I should have added some detail there... I'm currently using an Inhand IR302 4G router, some models have 2 cellular SMA connectors but mine only has one. Currently has 1 tiny cellular antenna but wouldn't mind upgrading it if possible, I'd quite happily spend £80 ish but no idea what I'm looking at when it comes to 4g antenna. Granted it's s not the fastest router in the world (although better than my smart phone) but so far very reliable & stable, natively runs from between 9 and 36 volts with very low power consumption...