Advertising on outdoor billboards can be quite efficient as they are able to catch the passer-byes attention easily. So if you are targeting at people at a specific place in the US and need to reach out to US clients then offline billboard advertising or the outdoor billboards advertisement cane be effective. The billboards used in this case are very big in size so that people can notice them easily. The text size is large enough so that the people driving by it can read it without straining their eyes. The bill board ads can be placed at a specific location or you can also opt for the bus bill board advertising which is economical and is gaining a lot of popularity in the US.
In order to use offline billboard advertising in US, you can contact a company that rent out the bill board space. You can then rent it and reach out to the people easily. If you find the offline billboard advertising to be beyond your budget then you can try choosing the online advertising that can help you reach out to the target consumers. Choosing geo targeted traffic would enable you to make your campaign more successful and would enable you to reach out to the target clients.