There are both boosters and improved antennas.. Neighbor just got what looks like a dang good USB connected Wi-Fi antenna.... Alas his I(ncomplete)-Pad does not have a USB port so he can not use it.. (Why I use complete comptuers and tablets).
Sorry I-folks.
But I use a Wireless game adapter modified for high gain and it is amazing how well it works.
now for someone like him
The WGA (linksys product) is a "Wi-Fi Modem" so my home router thinks it is a cable modem and treats it as such.
My laptops, Desktop, Tablet and phone, along with my ReplayTVs (Which do not use the internet but do use the intra-net (LAN). all connect to the router here in the RV.. Works great.
In some campgrounds in fact I have given others the pass key to connect because even though I'm over 1.5 Times as far from the router.. They get me strong, and the park not at all (And I make sure we are non-competing channel wise).